HY 1-8S Lipo Battery Voltage tester and low voltage buzzer alarmFeatures: Use for 1~8S Lipo/Li-ion/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 Dimension:40 x 25 x 11mm Weight:9g Description -Function of checking your lipo cells voltage -Function of lower voltage warning before and in flight -Automatically protects against reverse connection -Test the working state of lithium battery -Protect the battery from overcharging or overdischarging Alarm set value When the voltage is below the set value , it will sound the buzzer with red LED light , pre-set value 3.3V , Push key which can change the voltage settings and save. The Alarm sounds and red lights to warn you when the battery voltage is becoming lower than default setup or your setup. It can prevent your lipo battery being damaged due to low voltage The default alarm voltage is 3.3v, the min. voltage can be adjusted by the button Package:Poly bag Includes： 1 X Li-Po tester