Remote Control Helicopter Spare parts Battery Monitor Alarm 1S 8 S Description 1 Brand New High Quality 2 Use for 1 8s Lipl Li ion Li Mn Li Fe Voltage detection pricision 0 01V Unit voltage display range 0 5V 4 5V Total voltage display range 0 5V 36V 1S test mode voltage range 3 7v 30v Low voltage alarm mode for 2 8S Alarm set value range OFF 2 7V 3 7V 3 When the voltage is below the set value it will buzzer with red LED light pre set value 3 3V 4 Push key which can change the voltage settings & save 5 Size 3 9cm x 2 4cm x 0 9cm Appliable for RC Quadcopter helicopter multicopter car boat & airplane 1S 8S Lipo Li ion Li Mn Li Fe battery Features This product is using for detecting 1S 8S lithium battery Detect the voltage of each battery core automatically support reverse connection protection To know the working state of your battery anytime protect the battery from overcharge & over discharge The red LED will flash the buzzer will beeping when the voltage is below the set point The factory default setting is 3 3V press the button to change the voltage setting & it will save your current setting automatically Package Included 1 x Voltage Buzzer Alarm Customers real shot