The Therapist’s Choice TENS muscle stimulator and muscle recovery device that provides prescription strength pain relief and is Easier to Use TENS unit on the market today. Powered by a 9Volt battery, this TENS machine is proven to be powerful and durable. Our TENS unit is equipped with 3 Modes that are Easy to Operate by Dials. Has 100mA Powerful output to tackle back pain, neck pain, joint pain, or as a muscle relaxer. The modes are: Burst Normal Modulation. The Intensity of the TENS device is controlled via two control knobs that allow you to control the stimulation power of the dual channel pulses. Each channel controls 2 electrode TENS unit pads. The package comes with 4 starter electrode pads of premium quality and will last multiple sessions. Technical Specifications: Dual Channel, 3 Modes, Timer, & Safety Amplitude Cap, 100mA Output, 3 Modes: Burst, Constant, Modulation, Microprocessor Technology for precision dial performance, Voltage: Adjustable, 0 to 50V (Load 500 ohm), Pulse Amplitude: Adjustable, 0-100mA at 500 ohm load each channel, Pulse Width: Adjustable, 30-260(uS), Pulse Rate: Adjustable, 2-150(Hz), Wave Form: Bi-Phasic Square Pulse, Timer: 15,30, Constant .Therapist’s Choice is a registered trademark of Clinical Health Services, Inc Attention: Refer User Manual before use and make sure to read warnings/precautions/contra indications before use. If you have any questions, please message us or contact your healthcare practitioner