Cell Spy Alarm - 8S Audio Voltage Tester 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 Can also read the cell voltage of 1S batteries with Ultra Micro connectors when used with our Micro-6