A dual channel digital TENS with memory function that can store the treatment time used by the patients. The Physical Therapist can then check the units to make sure the unit is used as suggested. This device has a large liquid crystal display and press buttons, which is a great design for people who have difficulty reading the small inscription on the panel or turning the small dials. Features: 12 Preset Programs Channel: Dual, isolated between channels Pulse Amplitude: 0-100mA peak to peak into 500 ohm load Pulse Rate: Adjustable, from 1Hz ~ 150 Hz, 1 Hz/step Pulse Width: Adjustable, from 50 uS ~ 300 uS, 10 uS/step Mode: B, N, M, S1, S2 Timer: Selectable: 1 - 60 minutes or continuous Wave Form: Asymmetrical Bi-Phasic Square Pulse Voltage: 0-50 V peak into 500 ohm load Supplied with the following accessories: 1 x Carry Case 2 x TENS Leads 1 x Operating Manual 1 x 9V Battery 1 x Pack of AllCare Self-Adhesive Electrodes (4 Electrodes per pack)