Esper Hand 2 Technical Specifications
Esper Hand 2 is a self-learning, multi-articulating bionic prosthetic hand designed for people with upper-limb loss or congenital limb differences. It features five individually powered digits, EMG-based control, touchscreen-compatible fingertips, IPX5-rated water protection, customizable grips, and Bluetooth connectivity with the Esper+ mobile app.
Esper Hand 2 is designed for everyday use, professional tasks, household activities, and active leisure when fitted and configured by a qualified prosthetist.
Esper Hand 2 at a glance
Feature | Esper Hand 2 specification |
|---|---|
Device type | Multi-articulating bionic prosthetic hand |
Control system | EMG-based control with support for single-site, dual-site, and multi-sensor configurations |
Adaptive control | Machine-learning-based signal adaptation and personalization |
Digits | Five individually powered digits |
Finger movement | Motorized finger flexion and extension; adaptive finger behavior around objects |
Thumb movement | Motorized thumb movement with passive adaptation |
App connectivity | Bluetooth connection with the Esper+ mobile app |
Grip customization | Add, edit, and remove custom grips in the Esper+ app |
Active grip memory | Up to 6 active grips in the Basic Kit |
Standard grips | Free Palm, Precision Pinch, Tripod, Bottle, Utensil, Lateral, Fist, Tap |
Touchscreen compatibility | Four non-thumb fingers—index, middle, ring, and little fingers—are touchscreen-compatible. The thumb is not |
Water protection | IPX5-rated protection for safe everyday contact with water |
Sizes | Small and Large |
Sides | Left and Right |
Wrist options | Esper QDW, Standard QDW, Low Profile SWC, Flexion Wrist with Esper QDW |
Operating voltage | 6-8.4 V, 7.4 V nominal |
Maximum current | 8 A for Small and Large |
Full charge time | Up to 5 hours |
Warranty | 24-month warranty |
What is Esper Hand 2?
Esper Hand 2 is a bionic prosthetic hand that uses electromyographic signals from the user’s muscles to control hand movements. EMG sensors detect muscle activity, send the signal to the prosthesis, and the microprocessor converts the signal into a corresponding hand movement or grip.
The hand is designed to support natural-looking movement, independent finger control, grip personalization, and daily interaction with common objects, tools, and touchscreen devices.
Who is Esper Hand 2 for?
Esper Hand 2 is intended for people with upper-limb loss or congenital limb differences, including users with below-elbow, above-elbow, or shoulder-level limb absence. The device should be used only after consultation, fitting, and configuration by a qualified and certified prosthetist.
Detailed technical specifications
Dimensions and weight
Parameter | Small | Large |
|---|---|---|
A - Length from thumb base to tip of middle finger | 160 mm / 6.30 in | 185 mm / 7.28 in |
B - Overall hand length | 183 mm / 7.20 in | 195 mm / 7.68 in |
C - Hand + QDW wrist length | 208 mm / 8.19 in | 220 mm / 8.66 in |
C - Hand + SWC wrist length | 190 mm / 7.48 in | 204 mm / 8.03 in |
D - Palm width | 70 mm / 2.76 in | 83 mm / 3.27 in |
E - Palm depth | 27 mm / 1.06 in | 29 mm / 1.14 in |
F - Wrist diameter | 48 mm / 1.89 in | 55 mm / 2.17 in |
G - Knuckle circumference | 180 mm / 7.09 in | 210 mm / 8.27 in |
Weight - Hand + QDW | 460 g / 16.23 oz | 611 g / 21.55 oz |
Weight - Hand + SWC | 425 g / 14.99 oz | 576 g / 20.32 oz |
Load limits
Load type | Small | Large |
|---|---|---|
Maximum carry load, static | 30 kg / 66 lb | 35 kg / 77 lb |
Maximum functional carry load, dynamic | 20 kg / 44 lb | 25 kg / 55 lb |
Vertical push-down load through knuckles | 30 kg / 66 lb | 30 kg / 66 lb |
Individual finger carry load, dynamic | 10 kg / 22 lb | 10 kg / 22 lb |
Fingertip extension load | 2 kg / 4.4 lb | 2 kg / 4.4 lb |
Exceeding the specified load limits may damage the device or affect its performance.
Grip forces
Grip type | Small | Large |
|---|---|---|
Precision pinch | 6 N / 1.35 lbf | 12 N / 2.70 lbf |
Tripod | 10 N / 2.25 lbf | 16 N / 3.60 lbf |
Power / Fist | 15 N / 3.37 lbf | 30 N / 6.74 lbf |
Key / Lateral | 4 N / 0.90 lbf | 9 N / 2.02 lbf |
Grip force depends on the selected grip type, object shape, contact surface, and prosthesis configuration.
Hand and wrist mobility
Parameter | Small | Large |
|---|---|---|
Maximum hand opening | 78 mm / 3.08 in | 100 mm / 3.94 in |
QDW wrist rotation | Unlimited | Unlimited |
SWC wrist rotation | 350° | 350° |
Time from open to full power grip | 0.99 seconds | 0.99 seconds |
Finger degrees of freedom
Finger | Degrees of freedom |
|---|---|
Thumb | 2 degrees of freedom: motorized abduction/adduction and motorized thumb movement, with passive adaptation around objects |
Other fingers | 1 degree of freedom: motorized flexion and extension, with passive adaptation around objects |
Esper Hand 2 is designed to support independent finger movement and object-conforming grip behavior.
Power and battery
Parameter | Specification |
|---|---|
Operating voltage | 6-8.4 V, 7.4 V nominal |
Maximum current | 8 A for Small and Large |
Socket battery capacity | 2600 mAh |
Full charge time | Up to 5 hours |
Charging approach | Powered by batteries built into the socket; the hand does not require a separate charging process |
Operating conditions
Parameter | Acceptable range |
|---|---|
Temperature | -20°C to +40°C / -4°F to +104°F |
Humidity | Up to 98% at 25°C / 77°F |
Atmospheric pressure | 700-1060 hPa |
Protection rating | IPX5 without glove |
For long-term performance, avoid harsh external factors and follow the use and care instructions provided by the manufacturer.
Control system and app
EMG control
Esper Hand 2 uses electromyographic sensors to detect muscle activity and translate it into hand movement. The device can support several sensor and control configurations depending on the user’s clinical needs, socket design, and prosthetic setup.
Supported control configurations include:
Control configuration | Description |
|---|---|
Single-site control | Uses signals from one muscle site to operate the prosthesis |
Dual-site control | Uses signals from two muscle sites, such as flexor and extensor signals |
Multi-sensor systems | Supports advanced configurations that analyze several EMG signals simultaneously |
Pattern recognition | Supports pattern-recognition control based on EMG signal analysis |
COAPT GEN2 compatibility | Compatible with COAPT GEN2 pattern-recognition control system, depending on fitting and configuration |
Esper+ mobile app
The Esper+ app allows users and prosthetists to personalize and manage the hand. App-supported functions include:
controlling the hand;
training muscle signals;
adjusting grips and sensors;
monitoring muscle activity;
creating, editing, and removing custom grips;
selecting control modes;
configuring sensor behavior;
accessing device status and support tools.
Grip patterns
Esper Hand 2 includes 8 standard grips and allows users to create up to 24 custom grips through the Esper+ app. Each grip includes an open and closed position.
Standard grips
Grip | Intended use |
|---|---|
Free Palm | Neutral resting position for relaxed hand posture |
Precision Pinch | Small-object handling, such as keys, cards, or small components |
Tripod | Three-finger grasp for medium-sized objects, tools, and writing objects |
Bottle | Cylindrical grip for cups, bottles, glasses, and similar objects |
Utensil | Holding writing tools, drawing tools, and precision instruments |
Lateral | Holding flat or thin objects such as keys, cards, and coins |
Fist | Secure grip for bottles, soft objects, bags, and larger items |
Tap | Pressing buttons, using keyboards, and interacting with touchscreens |
All fingers support touchscreen interaction. The Tap grip is optimized for stable touchscreen and button interaction.
Water protection
Esper Hand 2 has IPX5-rated water protection for safe everyday contact with water. The hand is designed to tolerate common daily water exposure, such as dish washing or exposure to rain.
Esper Hand 2 should not be submerged, used in high-pressure water, or exposed to salt water, chlorinated water, abrasive materials, solvents, or chemical cleaning agents. After exposure to water, the device should be wiped with a dry cloth and left to air-dry at room temperature.
Esper Hand 2 is water-resistant for everyday use; it is not intended for swimming or prolonged submersion.
Compatibility and wrist options
Esper Hand 2 is designed for broad compatibility with prosthetic components, including a wide variety of myoelectric sensors, batteries, and control schemes. Final compatibility should be confirmed by a qualified prosthetist and by Esper Bionics documentation.
Wrist and connection options
Wrist connector option | Features and compatibility |
|---|---|
Low Profile SWC | Supports 350° passive wrist rotation |
Esper QDW | Esper quick-disconnect wrist option with a modified insert-and-rotate mechanism, compatible with common prosthetic connections |
Standard QDW | Compatible with common prosthetic wrist connection standards, allowing integration with compatible prosthetic systems. |
Flexion Wrist with Esper QDW | Currently in development. Final specifications are subject to change |
Esper Hand 2 supports multiple wrist connector options, including low-profile, quick-disconnect, and future flexion wrist configurations. Depending on the selected connector, clinicians can optimize wrist rotation, compatibility with prosthetic systems, and ease of prosthesis attachment or replacement.
Option | Description |
|---|---|
Low Profile SWC | Short wrist connector option with 350° wrist rotation |
Esper QDW | Esper quick-disconnect wrist option with a modified insert-and-rotate mechanism, compatible with common prosthetic connections. |
Standard QDW | Standard quick-disconnect wrist option |
Flexion Wrist with Esper QDW | WIP |
Ordering information
Each Esper Hand 2 product code identifies the hand size, side, wrist configuration, water protection option, color, and a unique serial number. This standardized naming convention helps clinicians, distributors, and service teams identify the correct device configuration.
Example order code: EH S L O W B 1234
Code segment | Meaning | Options |
|---|---|---|
EH | Product code | Esper Hand 2 |
S / L | Hand size | S = Small, L = Large |
L / R | Side | L = Left, R = Right |
F / O | Wrist option | O — Without wrist joint; F — with flexible joint, |
W / O | Water protection option | W — Water-resistant, O — No water protection |
B | Hand color | B = Black |
1234 | 4-Digit Serial |
Use and safety limitations
Esper Hand 2 should be used only after fitting and consultation with a qualified prosthetist.
Esper Hand 2 is not intended for high-impact or extreme activities such as rock climbing, skiing, powerlifting, or mountain biking. Excessive strain can damage the device and may void the warranty.
Users should avoid:
submerging the device;
exposing the device to salt water or chlorinated water;
using high-pressure water on the device;
using solvents, bleach, abrasive materials, or chemical cleaners;
charging or powering the device while wearing it if the configuration does not support safe charging;
attempting to repair the device without authorized service support.
Esper Hand 2 compared with selected multi-articulating bionic hands
Esper Hand 2 | bebionic | Zeus V2 | Adam’s Hand | COVVI Hand | |
|---|---|---|---|---|---|
Manufacturer | Esper Bionics | Ottobock | Aether Biomedical | BionIT Labs | COVVI Ltd |
Grip control | 8 standard grips; 6 active grip; 18 inactive grip; Supports up to 24 custom grip | 14 grip options, 8 selectable | 14 predefined + 10 configurable | Fully adaptive—no manual grip selection | Programmed grips, app-customizable |
Water/dust rating | IPX5 | Not rated for showering/bathing | Not water-resistant — avoid direct exposure | IP67 (only with Adam’s Skin glove) | IP44 (hand only; wrist interface excluded, no submersion) |
Static load or Maximum Carry Load? | 30 kg for S size; 35kg for L size; | 45 kg hook grip; 25 kg per finger; 90 kg through knuckles | 20 kg static carry | 40–45 kg hook grip; 20 kg per finger; 120 kg through knuckles | 30 kg carrying; 16 kg per finger; 90 kg through knuckles |
App support | Bluetooth app Esper+ (iOS/Android), clinician + patient access | Prosthetist-led (bebalance) | Aether Digital Platform | MyoLogic / MyoLogic Pro | COVVI Go |
Warranty | 24 months (+1-yr extension available) | 2 years standard (3/5-yr extended) | 2 years standard; distributor docs cite 6-month service interval — verify with manufacturer | Up to 5 years, incl. annual check-up + loaner hand (confirmed) | 24 months hand / 3 months glove (extendable to 36–60 mo.) |
Serviceability | Clinician-serviceable, replaceable digits | Trained/authorized service pathway | Locally repairable by accredited clinicians | Field-serviceable, in-clinic repair in <1 hour | Glove service requires certification |
US L-codes (verify per configuration) | L6880 | L6880 (+L6621 flex wrist, +L6629 QD collar) | Configuration-dependent | L6880, L6895, L6621, L6629 | L6621, L6629, L6880, L6895, L7367 |
Grip Force | |||||
Motorised Thumb | Fully motorised (2 axis); active abduction adduction | Partial — powered flexion/extension; opposition/lateral positioning is manual | Partial — powered flexion/extension; opposition/non-opposition positioning is manual | Partial—powered flexion/extension; abduction/adduction is passive and manually positioned | Yes—powered rotation between opposition and non-opposition |
Frequently asked questions
Is Esper Hand 2 waterproof?
Esper Hand 2 has IPX5-rated water protection for safe everyday contact with water. It is designed to tolerate rain and similar daily exposure, but it should not be submerged, used for swimming, or exposed to high-pressure, salt, or chlorinated water.
How many grip patterns does Esper Hand 2 have?
Esper Hand 2 includes 8 standard grips: Free Palm, Precision Pinch, Tripod, Bottle, Utensil, Lateral, Fist, and Tap. Users can create, edit, and remove custom grips in the Esper+ app. Up to 6 active grips can be stored in the Basic Kit.
Does Esper Hand 2 work with touchscreens?
Yes. Four Esper Hand 2 fingertips are touchscreen-compatible. The Tap grip is specifically optimized for pressing buttons, using keyboards, and interacting with touchscreens.
What control system does Esper Hand 2 use?
Esper Hand 2 uses EMG-based control. It supports single-site, dual-site, and multi-sensor configurations, and it can support pattern-recognition control depending on the user’s setup and prosthetic configuration.
Can patients adjust Esper Hand 2 settings themselves?
Yes. Through the Esper+ app, users can personalize grips, train muscle signals, adjust sensors, and manage grip behavior. Prosthetists can also use the app for setup and configuration.
What are the available sizes for Esper Hand 2?
Esper Hand 2 is available in Small and Large sizes, with left and right hand options.
How much does Esper Hand 2 weigh?
Esper Hand 2 weighs 460 g with QDW and 425 g with SWC in size Small. In size Large, it weighs 611 g with QDW and 576 g with SWC.
What is the maximum carry load of Esper Hand 2?
The maximum static carry load is 30 kg / 66 lb for size Small and 35 kg / 77 lb for size Large. The maximum dynamic functional carry load is 20 kg / 44 lb for size Small and 25 kg / 55 lb for size Large.
What is the maximum hand opening?
The maximum hand opening is 78 mm / 3.08 in for size Small and 100 mm / 3.94 in for size Large.
What is the full charge time?
The full charge time is up to 5 hours, depending on the battery and charger configuration.
Is Esper Hand 2 compatible with third-party sensors and batteries?
Esper Hand 2 is designed to work with a wide variety of myoelectric components, sensors, batteries, and control schemes. Final compatibility should be confirmed by a qualified prosthetist and Esper Bionics documentation.
Which wrist options are available?
Esper Hand 2 supports Esper QDW, Standard QDW, Low Profile SWC, and Flexion Wrist with Esper QDW options.