3 in 1 2-6S RC Lipo Battery Voltage Meter Monitor Tester Signal Loss Alarm Loss Aircraft Finder Low Voltage Buzzer DIY for RC Models Description This is a 3in 1 Li Po Battery monitor, Discovery buzzer Signal loss alarm functions. Built-in ultrahigh brightness LEDtwin loud buzzers. Item Name: Signal Loss Alarm Loss Aircraft Finder Working voltage: 5.2-26V DC, 2-6 Cells Li Po Standby current less than 10m A Working current, Max 120m A (blinkingbeeping) Voltage threshold setting: 3.4-3.7V/cell (Red LED) Twin loud buzzers, 85db each Ultrahigh Brightness LED, 20lm, 0.2w, Blue Features Suit for fixed-wing copters, helicopters, multicopters, RC cars, etc With Battery monitor function Long press 3 seconds to enter the voltage threshold setting;short press to select voltage threshold value between 3.4-3.7V (red led indicate);10 seconds with no operation, will auto save the current setting. If the total voltage is below the "holding value X cell", the alarm will continue to beep & flash blue until the voltage reaches or exceeds the set value. With Discovery buzzer function Only plug the Y cable wire to Aux channel of receiver to enable the function; Available signal of receiver is a must, the alarm is started by manual; With Signal loss alarm function Firstly turn on the transmitter, & plug the alarm to reciever throttle channel with Y cable wire, then turn on the receiver. This function is auto start. When the receiver is power on, the alarm will auto start in following situations: Turn off the tr