The shutter door remote control is to control the switch of the shutter door through the radio frequency signal, and its commonly used RF frequency is 433MHz. Therefore, the RF chip of the remote control should be 433MHz, not 433A. If you want to replace the chip of the remote control, you need to confirm that the RF frequency of the chip matches the receiver of the shutter door. If you are unsure, contact the shutter manufacturer or installer for more accurate information and recommendations.
433 wireless control itself. You need to understand the protocol.