... backlight,display output energy, mode,self-test state,resistance and voltage SpecsReceiverSize70cm*20cm* ... 11cmWeight2.0kgFrequencyActive: 577Hz,8kHz,33kHz,133kHzPassive:ower -50/60Hz, user-selectableDepth0~6mVoice directionAudio adjusts according to signal ... 5# battery, continuous 8hours Accessories: Transmitter Receiver Coupled Inductive Clamp Joint Cable Package ...