Feature: 1. Advanced Technology: The wireless RF remote control uses RF technology, signals can be transmitted through walls, floors and doors to control the receiver stably anywhere within a reliable distance. 2. Security Assurance: Learning codes has a high level of security, and when the remote is lost, the remote control switch can delete the old codes and relearn the new codes, so you can control it at any time. 3. Easy to Operate: The remote control relay switch is very easy to set up, learn, relearn, and control. Stable and reliable performance, high sensitivity to receive. Configure 1 remote control, use more flexible. 4. Widely Used: The wireless RF remote switch is mainly used in lamps and lanterns, electric doors and Windows, lifting equipment, gates, elevators, industrial control and security industry and other fields. 5. Working Modes and Stable Performance: The 4 CH relay module has three modes of moving, self locking and interlocking. Resist interference, it adopts non directional wireless encoding technology, allowing independent control. Specification: Item Type: Remote Control Relay Switch Shell Material: ABS Operating Frequency: 433MHz Working Mode: Click, Self Lock, Interlock Mode Output Mode: Wiring Terminal Demodulation Method: ASK Control Mode: Remote Control Remote Control Built in Button Battery: 4 x CR2016 Battery (75mah). Package List: 1 x Replay Switch2 x Remote Control Note: 5. Two point and two point self lock: press the codes learning key of the controller for five times, and the LED indicator blinks for five times and goes off. Then press any key of the remote control, and the LED indicator blinks for three consecutive times and goes off, indicating that the codes matching is successful. Remote control two button touch mode, two button self lock mode. 6. Double self‑lock and double interlock: press the learn codes key of the controller for six times, and the LED indicator blinks for six times and goes off. Then press any key of the remote control, and the LED indicator blinks for three consecutive times and goes off, indicating that the codes matching is successful. Remote control two keys self lock mode, two keys interlock mode. (2) Codes clearing operation Hold down the codes learning button of the controller for about 8 seconds. If the indicator blinks several times and goes off, the codes is cleared successfully. (3) Description of working mode Click mode: press the button of the remote control, the controller relay pulls in, release the button of the remote control, the controller relay disconnects. Self locking mode: press the button of remote control A once and the controller relay will close. Press the button of remote control A again and the controller relay will disconnect.