The Comfy Stim Plus®is a upgraded combination unit of TENS and EMS. It features 5 TENS modes, 2 EMS modes and additional 24 preset programs. The pulse width, pulse rate, ramp time, on time, off time and timer are fully adjustable. The user can identify if it is a TENS or EMS mode by the reading on the top of LCD. •Pulse Amplitude: Adjustable, 0-100 mA peak into 500 ohm load. •Wave Form: Asymmetrical Bi-Phasic Square Pulse •Size: 10.1cm(L) x 6.1cm(W) x 2.45cm(H) •Weight : 150 grams with battery. •On Time: ustable, 2~90 seconds , 1 Sec./ step •Off Time: Adjustable, 0~90 seconds , 1 Sec./ step •Output Type: TENS and EMS