Backlit negative LCD with colour display Target position graphic indicator Initial curve shape Biphase square-wave pulse 20 preset moderate programs Auto key lock Channel dismissal & recall Programs for tens, EMS & massage Smart contact detection 2-in-1 Lead Wire unique doctor program Intensity adjust knob Muscle toning and relaxation programs 2 Independent channel Pulse duration s 40~250¦Ì Pulse frequency 1~120Hz Output voltage Max. 90 vpp (at 500 ohm) Output current Max. 180mApp (at 500 ohm) Power supply 3x AAA battery Treatment time adjustable from 5 to 90 Minutes Intensity adjustable from 0~15 Operation conditions 10¡ãC~40¡ãC (50¡ãF~104¡ãF) ; 30~85% RH Storage conditions -10¡ãC~50¡ãC (14¡ãF~122¡ãF) ; 10~95% RH Item size: 100x72x22.5 mm (incl. intensity adjust knob)