The Pain Remedy TENS PLUS features a convenient wireless design that can be used almost anywhere on the body. The rechargeable receivers, in combination with snap style electrodes, send electrical impulses to stimulate the nerves and block pain signals. Indications: temporary relief of pain associated with sore or aching muscles of the back, arms, or legs, due to strain from exercise or normal household and work activities. Reusable, long-lasting snap Body Pad (3 x 5'') is included with each unit. Receiver Dimensions: 2.25” x .5” Remote Dimensions: 3.5” x 2.2” x .4” Power supply:DC 3.7V Lithium Waveform:Asymmetric biphasic pulse Intensity:0-80 mA @ 500 Pulse Width: 100μS Frequency: 1- 60 Hz Mode 1: 53 Hz; Mode 2: 5.8 Hz; Mode 3: 1.3 Hz; Mode 4: 1- 60 Hz Pulse Amplitude (V): 0-48.5 Mode 1: 0 - 3 7. 9 V; Mode 2: 0-46.8V; Mode 3: 0-48.5V; Mode 4: 0 - 41.1V Timer: Continuous for 45mins duration period; unit automatically shuts off at completion