The Metron Pro Tens Unit with Time and Carry Case is a regular TENS with adjustable pulse width, pulse rate, intensity, modes and an accurate timer of 15, 30 and 60 minutes, which will stop output at preset time. Specifications: Channel: Dual, isolated between channels Modes of Operations: Continuous, Burst, Modulation Pulse Intensity: Adjustable 0-80mA peak into 500 ohm load each channel, constant current Pulse Rate: 2Hz-150Hz (adjustable) Pulse Width: 30μs - 260μs (adjustable) Time: Continuous, 30 min, 60 min Burst Mode: Burst consists 2 bursts per sec at 100 Hz Wave Form: Asymmetrical Bi-Phasic square pulse Voltage: 0-100 Volt (open current) Power Source: 9 volt battery Dimensions: 95(H) x 60(W) x 23(D) mm Weight: 115 grams (battery included) Warranty: 1 Year Supplied with the following accessories: Carry Case 2 x TENS Leads Operating Manual 1 x 9V Battery 1 x Pack of Metron Self-Adhesive Electrodes (4 electrodes per pack)