niceEshop(TM) 1-8s Lipo Digital Battery Voltage Tester with Low Voltage Buzzer Alarm,Black Buzzer sounds and red lights to warn when the battery voltage is too low Prevent LiPo battery damaged due to over discharging For 1 Cells 3.7V up to 8 Cells 29.6V LiPo batteries Suitable for 1-8s LiPo, Li-ion, LiMn and LiFe batteries Adjustable alarm voltage (default setting 3.3v out of factory)