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Lipo Battery Low Voltage Tester Checker1S-8S Buzzer Alarm with LED Indicator for RC Helicopter for RCDrone/Helicopter/Boat/Plane. A very useful RC Tool for your batteries,Test the working state of lithium battery. Protect your battery fromovercharging or overdischarging. Specification: Weight: 11g Dimension: 40 * 25 * 11mm Display: LED Voltage detection precision: ±0.01V Unit voltage display range:0.5-4.5V Total voltage display range:0.5-36V 1S test mode voltage range: 3.6-32V Low voltage alarm mode for:2-8S Alarm set value range: OFF-2.7-3.8V Package Content: 3 x Lipo Battery LowVoltage Tester Note: When the voltage lower than the set value,it will buzzer with red LED light. Pre-set value is 3.3V. Push key which canchange the voltage setting and save.