Frequency Reader Counter is a wireless remote control testing device that accurately detects and displays the frequency of remote-controlled devices. The Frequency Counter test method is simple: bring the remote control device close to the frequency counter for accurate frequency detection. The effective test distance is within 10cm. Type: 250-450MHz Frequency Reader Counter, Wireless Frequency Counter Features: - Portable frequency counter design - Suitable for use in electric door controller manufacturing, automatic door systems, and related applications - Equipped with a 4-digit display for clear reading results - Compact and easy to operate and carry Test Range: 250MHz to 450MHz Valid Detection Distance: Up to 10cm Power Source: 9V 6F22 battery (not included) Operating Voltage: DC 9V Standby Current: 40mA Operating Current: 51mA Dimensions (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 wireless remote controls: Place the remote near the sensing area and press any button. The frequency will be displayed on the screen. 2. For infrared remotes or other transmitters: Point the remote toward the infrared receiver (INPUT) and press any key. A red light indicates the transmitter is functioning properly. This wireless remote control detector is intended solely for testing and educational purposes. Users are responsible for compliance with local laws and regulations. Not intended for illegal use. Designed for professional use in automotive repair shops, garages, workshops, and by automotive locksmiths. Color: Gray & White Material: Plastic Package Contents: 1 x Frequency Counter 1 x Battery Connector Note: Light reflection and differences in display settings may cause slight variations between the product color shown and the actual item. Measurement tolerance is +/- 1-3cm.