3 modes of operation: continuous, width modulation (50% decrease/increase of set width over 5 seconds), and burst (8 pulses per burst, 2 burst per second). The pulse rate adjusts from 2 - 150Hz and the pulse width adjusts from 50 -250us. Output intensity adjustable from 0-80mA. Kit includes four pigtail electrodes, two pairs of leadwires, one 9V battery, carrying case and instructions. 3.9"L x 2.75"W x 1"H. 4.6 oz. Limited 5-year warranty