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1-8S Lipo Battery Voltage Tester/ Low Voltage Buzzer Alarm - This is battery voltage checker and low voltage buzzer 2-in-1 unit. Special feature: 1S test mode test range 3.7 to 30V,which means you can test the battery pack without balance connectors like RX battery pack etc., LiPb or other power source voltage. In other words, this very little devise can be used as a simple digital voltage meter. Loudly buzzer can be heard from distance,you can put this device on your plane and use it as on- board alarm, so you can hear the low voltage alarm during flight. - Use for 1-8S Lipo/LiMn/Li-Fe - 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: 3.7-30V - Low voltage alarm mode for 2-8S - Alarm set value range: OFF-2.7-3.8V - Weight: 8.7g/ 0.31oz