An unbranded version with a cheaper price

With this device, you can easily locate and find your lost plane/helicopter , The effective range for this tracer is over 50 meters.Simply turn off your TX, the tracer will start to scream (just like the engine sound of the real airplane)You can find your plane by following the sound
Suitable for All PPM/FM, PCM/FM, AM Tx/Rx Specification:

Size:17 x 13 x 10mm
Weight:<5g
Operating Voltage(v): 4-6
Current Drain(mA): 1-35

Features:

Suitable Controller:All PPM/FM, PCM/FM, AM Tx/Rx
Loud> 85DB alarm gets your attention
Works with any standard servo channel
small dimensions and lightweight