This product is a wireless frequency test apparatus that can accurately test the frequency of the remote-controlled device and display it clearly, so that you can easily adjust the frequency you need when formulating the remote controller. With the effective ranges of 280-450mhz. Applicable to a variety of wireless remote controller, for car remote controller, electric door remote controller, electric car remote controller, and other remote controls, electric locks, garage doors; remote controls, access control, etc. Features: Reliable Performance: This product is a wireless remote controller frequency test apparatus that can accurately test the frequency of the remote-controlled device and display it clearly, so that you can easily adjust the frequency you need when formulating the remote controller. Compact Size: This handheld frequency tester is small in size, accurate in testing, easy to carry and easy to operate, with high precise and small error. Quality Chip: High precise chip efficiency stable and accurate data, fast and stable, more comfortable to work. And with the effective ranges of 280-450mhz. Digital Display: With a 4-digit screen, the test data can be clearly displayed, and the display shows four red numbers for you to read the data at a glance. Close-distance Perception Test: As long as you bring the remote controller close to the tester within 100mm, it can accurately test your remote controller Wide Applications & Usage Scenarios: Applicable to a variety of wireless remote controller, for car remote controller, electric door remote controller, electric car remote controller, and other remote controls, electric locks, garage doors; remote controls, access control, etc. Note: Test should avoids some electronic signal interference sources, such as: signal towers, base stations, poles, call cell phones, send and receive text messages, etc. Specifications: Name: Frequency Counter Material: plastics Battery: 1 * 9V 6F22 battery (Not included) Effective test range: 280Mhz to 450Mhz Valid Test Ranges: Less than 100mm Operation Voltage: DC9V Standby Current: 40mA Operating Current: 51mA Test coverage: 280-450MHZ Item size: 93 * 58 * 24mm / 3.66 * 2.28 * 0.94in Package size: 100 * 60 * 30mm / 3.94 * 2.36 * 1.18in Package weight: 65g / 2.29ounce Packing List: 1 * Frequency Counter 1 * Battery Connector