The Therapist's Choice TENS 12MT is a TENS muscle stimulator and muscle recovery device that provides prescription strength pain relief and is the Better Valued OTC digital 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 five(5) powerful TENS therapy modes of operation Plus a bonus of 7 Pre-set Programs to tackle back pain, neck pain, joint pain, or as a muscle relaxer. The modes are: Burst Normal Modulation Strength Duration 1 Strength Duration 2 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. Therapist's Choice OTC DIGITAL TENS 12MT Electrotherapy Device Channels: Dual Channel, isolated between channels Pulse Amplitude: Adjustable, 0-100 mA peak into 500 ohm load each channel. Voltage: 0 - 50V (Load: 500 ohm) Pulse Rate: Adjustable, from 2 to 150 Hz, 1 Hz/step Pulse Width: Adjustable, from 50 to 300 microseconds, 10uS/step 12 Modes: B(Burst), N(Normal), M(Modulation), SD1(Strength Duration), SD2, P1, P2, P3, P4, P5, P6, P7 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