Two channel TENS / EMS. Small and handy, and easy to set up. Memory protection function for programmed parameters. Saves total number of treatments and treatment. Saves earlier treatment mode. Specification: Power supply: DC4, 5V, 3xLR6 (AA). (Batteries not included) Channels: 2 that are controlled independently. Pulse shape: Symmetrical, two-phase rectangular pulse. Amplitude: 0-90mA (peak) at 500Ω load. Phase duration: 50-200μs ± 10μs Frequency: 1-100Hz ± 5%. 5 Modes: Constant, Burst, Surge, Sweep, Random. On / Off time: 1-30 seconds / On time x 2.3 or 5. Timer: 1-60 minutes. Display: LCD (46x31mm). Weight: 120 grams (without batteries). Size: 60x120x40 mm (LxHxD). Other: Auto power off, lock the keyboard, indicating low battery. Comes complete with carbon rubber electrodes and cables gelpads. CE marked according to MDD directive.