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Quell Specifications

Looking for all the details you can handle? You’ll find them right here.

Quell Device



Biphasic with alternating leading phase, asymmetrical,

Regulated Current or Voltage


Net Charge per Pulse

Nominally 8 μC @ 500Ω per pulse; nominally 0 μC per sequential pair of pulses; zero net current

Maximum Output Voltage (±10%)

100 V

Maximum Output Current (<1KΩ load) (±10%)

100 mA

Pulse Duration (±4%)

200 - 400 μsec

Pulse Frequency (±4%)

60-100 Hz, randomly varying, or 30-50 Hz, randomly varying. Alternate pattern has uniform frequency distribution of 4 pulse sequences at 15-25 Hz; each pulse sequence lasts 8.6 msec with pulses evenly spaced; mean frequency is 80 Hz.

Pulse Pattern

Continuous or burst (4 pulse bursts, randomly 15-25 Hz with mean 20 Hz)

Maximum Phase Charge

18 μC

Maximum Current Density

0.6 mA/cm2 into 500Ω load

Maximum Average Current

2.8 mA into 500Ω load

Maximum Average Power Density

5 mW/cm2 into 500Ω load

Output Trips

No Load

Device not connected to patient

Insufficient Charge

Delivered charge below target

Over Load

Delivered charge above target

Electrode Peeling

Electrode dislodging from skin

Therapy Session


30 minutes or 60 minutes

Start Therapy

Click button once or via app

Stop Therapy

Click button 4 times or via app

Manual Intensity Increase/Decrease

0.5-2 mA / sec

Habituation Compensation

Adaptive stepwise increase in intensity during session




Self-adhering, single-patient use, multiple applications


Maylar substrate, silver electrode pads

Number of Electrodes

2, outer electrode area 28 cm², inner electrode area 33 cm²


Medical snap (male)


0.2 cm x 5.3 cm x 28.3 cm (exterior)




Permanent rechargeable battery

Battery Type

Rechargeable 3.7V Lithium-Ion battery

Battery Life

400 Charge Cycles

Charging Source

AC line adapter

Line Current Isolation

Patient disconnected when charging

Patient Leakage Current, DC

<10 μA

Patient Leakage Current, Enclosure

<10 μA



98 mm x 74 mm x 11 mm

Weight (without straps)



IP Classification


Operating Temperature Range

-5° C to 40° C

Atmospheric Pressure Range

70 kPa to 106 kPa

Relative Humidity Range

15% to 93%

Transport and Storage Temperature Range

-25° C to 70° C

Atmospheric Pressure Range

70 kPa to 106 kPa

Relative Humidity Range

10% to 93%

Guidance Documents & Standards


Draft Guidance for Industry and Staff: Class II Special Control Guidance Document: Transcutaneous Electrical Nerve Stimulator for Pain Relief (April 5, 2010)


IEC 60601-1, IEC 60601-1-2, IEC 60601-1-6, IEC 60601-1-11, IEC 62304


The Bluetooth word mark and logos are owned by the Bluetooth SIG, Inc. and any use of such marks by NeuroMetrix, Inc. is under license.

Communication between the Quell device and the Smartphone is via Bluetooth.

Disabling Bluetooth

While all sensitive data transmission is encrypted, Bluetooth functionality can be turned off for increased privacy. If Bluetooth is disabled, then the Quell Relief App will not function, but all other functions of the Quell device will operate normally.

To turn off Bluetooth:

  1. Plug the Quell device into the charger/wall outlet,
  2. Click and hold the button on the Quell device for approximately 10 seconds until the one orange and one white LED light up, then release the button.
  3. The Bluetooth module is now disabled.

To reactivate Bluetooth functionality, repeat the above steps. All six LED’s should be lit.

Bluetooth Specifications

Bluetooth Module

Bluegiga BLE 113 Bluetooth® Module with Bluetooth® 4.0 low energy radio

Transmit Power

+0 dBm

Receiver Sensitivity

-93 dBm

FCC Rules

Part 15C

Frequency Range

2402.0 - 2480.0

Output Watts




Quell App requires iOS version 10.0 or later or Android version 6.0 or later
Smartphone must support Bluetooth LE