KASOTEK RC 1-8S 2 IN 1 Lipo Battery Tester Low Voltage Buzzer Alarm LED Indicator Test your lipo's voltage and protect it from over-discharging with this one simple tool Displays individual cell voltages for up to 8 cells as well as your battery's total voltage Doubles as an onboard low-voltage buzzer to protect your lipos from being over-discharged during use Low voltage buzzer limit can be set between 2.7 and 3.8 volts Use for 1-8s Lipo/Li-ion/LiMn/Li-Fe