1. Frequency Reader Counter is a test frequency wireless remote control apparatus that can accurately test the frequency of the remote-controlled device, and can clearly be displayed. 2. Frequency Counter Test method is very simple, just need to test the remote control device close to the frequency counter will be able to accurately test out the remote control frequency. (Valid test range is not more than 10cm). Type:250-450MHZ Frequency Reader Counter Wireless Frequency Counter Frequency Counter Features: 1. Frequency Counter is a portable frequency counter 2. Great for electric door controller manufacturers, automatic door manufacturers and other fields 3. With a 4-digit screen, the result can be clearly displayed 4. Easy to use and carry Effective Test Range: 250Mhz to 450Mhz Valid Test Range: Less than 10cm Powered by a 9V 6F22 battery (Not included) Operation Voltage: DC9V Standby Current: 40mA Operating Current: 51mA Size(L x W x D): Approx. 9.3 x 5.8 x 2.4cm/3.7 x 2.3 x 0.9 inch How to use: 1: the measured wireless remote control frequency, the remote control on the sensing zone press any key to display the frequency shows the frequency of the remote control. 2: measured infrared remote control or other launch, the position of the remote control facing the infrared receiver (INPUT) click any key IR position red light, said some of the remote control transmitter normal. This wireless Remote control Detector & Duplicator is only for testing and study, Otherwise accept the consequences by yourself if violate the state laws in your country. just sell to Car repair service shop, Garage, workshop, it is also the Car locksmith tool. Color:Gray & White Material:plastic Package Contents: 1 x Frequency Counter 1 x Battery Connector 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.