Feature: 1. The device is equipped with a superheterodyne receiving circuit, which has better anti‑interference performance. 2. The ultra‑small size of this relay allows it to be used normally even in various narrow spaces. 3. It has wide compatibility and can be used as a remote control for various 433M fixed codes and learning codes. 4. This remote control relay is easy to install and use, and its performance is stable and reliable. 5. The high-quality PCB allows the internal components of the equipment to be perfectly connected to ensure good operation. Specification: Item Type: Wireless Remote Control Material: PCB Maximum Workload: 1A Working frequency: 433MHz Receiving Sensitivity: -105dBm Working Temperature: -20 to +70°C Output Mode: Inching, Self-locking, Interlocking Built-In Button Battery: 80mAh Button Battery Suitable for controlling small loads such as relays, small bulbs, small motors, etc.. Package List: 1 x Receiver1 x Transmitter Note: 1. Do not operate the control button quickly and frequently, because the controller is controlled by the microprocessor, and each operation state will respond within 1 second.2. If the LED light turns dark or the distance becomes short, please replace the battery.3. The receiving antenna must be soft, and the length should not be too long or too short, otherwise the transmitting distance will be affected. Please straighten the antenna as far as possible, and do not get close to metal objects or any magnetic object.