Includes four reusable electrodes, lead wires, Four AA batteries, carrying case, and instruction manual.

Digital TENS Unit Specifications:
Channels:             Dual
Waveform:            Asymmetrical Bi-Phasic Square Wave
Output:                   Constant Current
Intensity:                0-98 Ma Peak
Frequency:            1-150 Hz
Pulse Width:         10-250 µs
Modes:                   Constant, Burst, P.W modulation