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.

A modern bionic hand should be evaluated across several practical dimensions: control flexibility, app and software support, compatibility with existing O&P components, water and environmental protection, published load capacity, repairability, warranty terms, and reimbursement coding. These factors often matter more than a single headline specification.

This comparison looks at several widely discussed multi-articulating prosthetic hands: Esper Hand 2, bebionic, Zeus V2, Adam’s Hand, and COVVI Hand. The original comparison document focused on control, compatibility, water protection, load capacity, durability, warranty, and reimbursement; this article expands those parameters into a more complete clinician- and user-friendly guide.

Esper Hand 2 at a glance

Esper Hand 2
at a glance

Esper Hand 2 technical specifications
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 (Small and Large)
Full charge time	Up to 5 hours
Warranty	24-month warranty

Esper Hand 2 technical specifications
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 (Small and Large)
Full charge time	Up to 5 hours
Warranty	24-month warranty

Esper Hand 2 technical specifications
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 (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

Esper Hand 2 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

Esper Hand 2 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

Esper Hand 2 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

Esper Hand 2 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

Esper Hand 2 grip force by grip type
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

Esper Hand 2 performance characteristics
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

Esper Hand 2 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

Esper Hand 2 electrical specifications
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

Esper Hand 2 operating environment
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.

Grip patterns

EMG control

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.

Esper Hand 2 control configurations
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.

Wrist and connection options

Esper Hand 2 grip patterns and typical everyday applications
Grip pattern	Typical everyday applications
Free Palm (Rest)	Neutral resting position for a relaxed, natural-looking hand posture.
Precision Pinch	Picking up and holding small objects such as keys, cards, coins, and small components.
Tripod Grip	Three-finger grasp for holding medium-sized objects, tools, pens, pencils, and other writing instruments.
Bottle Grip	Cylindrical grip for holding cups, bottles, glasses, and other round everyday objects.
Utensil Grip	Holding pens, pencils, drawing tools, utensils, and other precision instruments.
Lateral (Key) Grip	Holding flat or thin objects such as keys, cards, coins, and similar everyday items.
Power (Fist) Grip	Securely holding bottles, soft objects, bags, handles, and larger everyday items.
Tap (Touchscreen) Grip	Pressing buttons, typing on 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.

Esper Hand 2 wrist connector options and compatibility
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.

Esper Hand 2 product code structure

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

Esper Hand 2 product code structure
Code segment	Represents	Possible values
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	F = Flexible wrist joint, O = Without wrist joint
W / O	Water protection option	W = Water-resistant, O = No water protection
B	Hand color	B = Black
1234	4-digit serial number	Unique product serial identifier

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.

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