Test ranges: Suitable for most makes and models of vehicles, including trucks, remote control devices, and household appliances. Digital display: Allows you to clearly view the tested frequency. High-quality material: Constructed from durable plastic, offering wear resistance and long-lasting performance. Battery power: Operates on a 9V battery for extended use; battery not included. The 9V battery is widely available at local retail stores. Note: When using the frequency tester, keep it away from other electronic devices that may cause interference, such as cell phones (set to airplane mode), smart watches, computers, fans, and LED lights. This control tester is designed to assist in diagnosing various types of IR (Infrared) and RF (Radio Frequency) remote controls. It helps verify whether the frequency of a new key or remote matches that of the original. Type: IR (Infrared) and RF (Radio Frequency) remote controls Frequency range: 10MHz - 1000MHz Power source: 9V battery (not included) Current consumption: 50mA How to use: Place the remote control in front of the LCD screen and press any button on the remote. A signal will be transmitted to the tester, and the corresponding frequency will be displayed numerically on the screen. Note: When testing a key fob or remote, ensure other electronic devices that may interfere with the signal are kept at least 1 meter away from the testing area. Examples include phones, lights, and other electronic devices. Important reminder: When handling the battery connector, avoid pulling the cable. Place the tester on a flat surface such as a desktop before connecting or disconnecting the battery, and do not let the device hang freely during this process. Color: Black Material: Plastic Package contents: 1 x Remote Control Tester Note: The package includes only the items listed above. Other accessories shown in images are not included. Note: Lighting effects and monitor settings may cause slight color variations between the product image and the actual item. Measurement tolerance: 1-3 cm.