Jobst® Relief® Knee High Compression Stockings, Large, 1 Pair Electrotherapy Extends from 4 cm to Jobst Ultrasheer 30 40 ThighHi Extends from 4 cm to 13 cm to reduce dead space for each application System includes device lead wires four self adhesive reusable electrodes 9V battery hard plastic carrying case and instruction manual * 3 Modes: Standard Modulate and Burst * Dual Channel * 30 and 60 minutes or continuous timer * Adjustable Pulse Width: 50 250 Microseconds * Pulse Rate: 2 150 Hz * Pulse Amplitude: 0 80 mA each channel * Waveform: Asymmetrical biphasic square pulse * One year warranty * FDA approved Reinforced heel Circumference: Ankle 10 to 11