DOORHAN TRANSMITTER2 TRANSMITTER4 433mhz Description: 1. Type of programming: Programming with the receiver 2. Number of channels: 4 3. Code: rolling code 4. Frequency: 433MHz Compatible Model Suitable for all DOORHAN models ! For example: DOORHAN TRANSMITTER 2 DOORHAN TRANSMITTER 4 DOORHAN TRANSMITTER -2 PRO DOORHAN TRANSMITTER -4 PRO DOORHAN Premium RC black 4 Include 1x Remote Control(Battery included) 1x Keychain 1x English Manual kindly note , our remote is the COMPATIBLE / REPLACEMENT /CLONE remote , not the original one. Programming Program to Gate / Garage Door Openers the same way as original DOORHAN Transmitter 4 remotes, please refer to your receiver's user manual. For a typical DOORHAN Garage Control Panel, the programming procedure is as follows: 1. Press and release the button R on the receiver. 2. The left side of display panel will show 0 then disappears immediately. 3. Press any button twice, coding is completed. 4. Press the transmitter button to test operation. Note: To remove a single transmitter's code or all transmitter codes from the receiver memory please refer to your receiver manual.