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 SwitchMaterial: ABS and PCBWorking Voltage: DC3.3V-DC24VMaximum Load: 1A (Better Load is Less Than 700ma (0.7A))Working Frequency: 433MHzFrequency Deviation: Greater Than or Less Than 0.2MHzWorking Temperature: -20 Degrees Celsius - and80 Degrees CelsiusReceiving Sensitivity: -114dBmModulation Method: Amplitude Modulation (AM)Output Status: Instantaneous Switch Lock AdjustableBuilt In Button Battery in the Remote Control: CR2016(75mAh) x 2.Package List:1 x Remote Control1 x RelayNote: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.