Feature: 1. Safe Design: The learning code has a high level of security, and the low repetition rate and re learning mode ensure safe use. 2. Not Afraid of Loss: When the remote control is lost, it can delete the old code and relearn the new one, so you can control it at any time. 3. Easy to Use: Very easy to set up, learn, relearn and control. Stable and reliable performance, and the receiving sensitivity is high. 4. Widely Used: Mainly used in lighting, electric doors and windows, gates, elevators, industrial control and security industries etc. 5. Packing: Equipped with 1 remote control, which is more flexible to use, and the safe design let you use worry free. Specification: Item Type: Wireless Remote Control Switch Material: ABS + PCB Working Voltage: DC3.3V-DC24V Maximum Load: 1A (Better Load is Less Than 700ma (0.7A)) Working Frequency: 433MHz Frequency Deviation: Greater Than or Less Than 0.2MHz Working Temperature: -20 Degrees Celsius - +80 Degrees Celsius Receiving Sensitivity: ≥-114dBm Modulation Method: Amplitude Modulation (AM) Output Status: Instantaneous Switch Lock Adjustable Built In Button Battery in the Remote Control: CR2016(75mAh) x 2. Package List: 1 x Remote Control1 x Relay Note: How to change the working mode:T4: Connect the learning button. Until the Led indicator of the receiver flashes once, it means that the T4 is successfully replaced.M4: Connect the learning button. Until the Led indicator of the receiver flashes twice, it means that the M4 has been replaced successfully.L4: Connect the learning button. Until the receiver Led indicator flashes 3 times, it indicates that the L4 is successfully replaced.