Instruction：

Connect the alarm between the servo and the receiver, i.e. act as a servo extension cord
Turn on your TX. and you will hear 2 x beep sound
Do not move any of the control stick on the TX or simply turn off the the TX. You will hear a continuous beep sound after 1 minute. It will stop once you turn on your TX or move the control stick
If you ignore the continuous beep sound for around 2minutes, the beep sound will change to a louder V sound
You need to disconnect the alarm from the receiver in order to switch off the alarm
Make Sure The Correct Polarity Before Turn On The TX
With this device, you can locate or find your lost plane/helicopter easily within the effective range for that tracker can over 50M,
Simply turn off your TX, the tracer will start to scream ( just like the   engines sound from the real airplane)
follow the lead and you can find your beloved plane