Remote control testers were developed to assist in diagnosing various types of (infrared) infrared and radio frequency remote controls. It can be used on most makes and models of vehicles, including trucks, remote control models and home appliances. Just place the remote control under the LCD display screen, press the button on the remote control to send the signal to the remote control tester, and the digital frequency will be displayed on the LCD screen. Battery powered:9V Current consumption:50mA Frequency range:10-1000MHZ Colour:Black Material:Plastic Package Contents: 1 * Frequency tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.