... alkaline LR14 © cellsTypical batteryOne 8# battery, working for 4-8hoursCharger220V,50~60HZ, optical 12V car chargerLCD displayAutomatic backlight,display output energy, mode ... voltage SpecsReceiverSize70cm*20cm*11cmWeight2.0kgFrequencyActive: 577Hz,8kHz,33kHz,133kHzPassive:ower -50/60Hz, user-selectableDepth0~6mVoice directionAudio adjusts according to signal strengthSingal indicateVoice ...