1. Frequency Reader Counter is a test frequency wireless remote control apparatus that can accurately test the frequency of the remote-controlled device and clearly display the result. 2. Frequency Counter Test method is very simple; just bring the remote control device close to the frequency counter to accurately measure 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): 9.3 x 5.8 x 2.4cm / 3.7 x 2.3 x 0.9 inch How to use: 1. For the measured wireless remote control frequency, press any key on the remote control within the sensing zone to display the frequency. 2. For measuring infrared remote control or other transmitters, point the remote control toward the infrared receiver (INPUT) and press any key. The IR position red light will illuminate, indicating the remote control transmitter is functioning normally. This wireless Remote Control Detector is for testing and study purposes only. Users are responsible for compliance with applicable laws in their country. Intended for sale to car repair service shops, garages, workshops, and professional use. Color: Gray & White Material: Plastic Package Contents: 1 x Frequency Counter 1 x Battery Connector Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allowed error is +/- 1-3cm.