Impulse 2000 Tens Unit, Each Pulse rate adjusts from 2 to 150Hz. Pulse width adjusts from 50 to 250us. Output intensity adjustable from 0 to 80mA. Kit includes:- 4 Pigtail electrodes- 2 pairs of leadwires-1 battery (9V)- Carrying case and instructions. Size: 3.9"L x 2.75"W x 1"H.