Description:When the model airplane loses its signal, there will be an audible alarm.If your plane has already been lost, you can easily find the plane according to the alarm soundAn alarm sound greater than 85 decibels is enough to draw your attentionSuitable for AM/FM PPM or FM/PCM remote control devicesCan be connected to any standard servo channelSpecification:Two modes of alarm soundWeight (g): 4.7Operating voltage (V): 4-6Current consumption (mA): 1-35Material:Plastic + electronic componentsSize Chart:Size:Approx. 17 x 13 x 10mm/0.66 x 0.51 x 0.39inchPackage Includes:2 Pieces Aircraft Finder Tracker AlarmNote:Please allow 1-3 mm error due to manual measurement.Color might be slightly different due to the color calibration of each individual monitor.