The Comfy EMS Plus®has 3 output modes of options including Constant, Synchronous and Alternate. There are also 12 preset programs available for quick selection of protocols. Wide ranges of parameters controlled by press buttons are very convenient for the physical therapist to create a new program. •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: Adjustable, 2~90 seconds , 1 Sec./ step •Weight: 150 grams (battery included) •Ramp Time: Adjustable, 1~8 seconds, 1 Sec./ step. •On Time: Adjustable, 2~90 seconds , 1 Sec./ step •Off Time: Adjustable, 2~90 seconds , 1 Sec./ step •Pulse Rate: Adjustable, 2~150 Hz , 1Hz / step •Pulse Width: Adjustable, 50~300µs , 10µs / step •Timer: Adjustable, 5-60 minutes or Continue. Adjustable in 5 minutes each step. •Output Mode: 3 modes, Constant ,Synchronous, Alternate, P(P1-12)