RMRC Battery Voltage Tester - With Audio Alarm LiPo 1-8s - 1 to 34v - Easy to use! Beeps when voltage reaches set level Adjustable Alarm Voltage (2.7v through 3.8v, and OFF) 1-8s operation with +-0.01V accuracy Displays number of cells and voltage of each Displays total voltage of entire pack 9g total weight