... adjustment.6. Multi - antenna and channel, direct display cable burial depth.7. Searching and measuring 50Hz running ... 8# battery, working for 4-8hoursCharger220V,50~60HZ, optical 12V car chargerLCD displayAutomatic backlight,display output energy, mode,self ... ~6mVoice directionAudio adjusts according to signal strengthSingal indicateVoice&LCD show (bar graph,numbers 0~999)Gain dynamic100dBAccuracy8kHz ...