RioRand 1-8 Cell Lipo Digital Battery Voltage Checker with Warning Alarm + 2-6 cell Lipo Digital Battery Voltage Checker Powered by RioRand Advanced Technology coreless motor,Dead Band Width : 2 usec Stall Torque : 1.5kg/cm at 4.8V Voltage : 3.0 - 7.2Volts Dimension : 22mm x 12mm x 29mm