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Large, digital LED displayProgrammable voltage thresholdHigh pitched low voltage warning buzzerFunction of checking your lipo cells voltageVoltage display function and low voltage alarm functionProtect the battery from overcharging or over dischargingTest the working state of lithium batteryAutomatic protects against reverse connectionCompatible with 1-8s Lipo/Li-ion/LiMn/Li-Fe The 1S-8S Cell Checker with low voltage alarm features loud twin piezo alarms to notify you once your cells reach a user defined voltage. You can customize the alarm to sound at a voltage between 2.7V~3.8V per cell in 0.10V increments by pressing the setting mode button. Specification:Voltage detection precision to 0.01VCell voltage display range: 0.5V-4.5VPack voltage display range: 0.5V-36V1S test mode voltage range: 3.7V-30VLow voltage alarm mode for 2-8SAlarm set value range: OFF-2.7V-3.8VWeight: 14g/eachDimension: 40 * 25 * 11mm/each(pin included)