Compatibility - This remote control is an aftermarket replacement remote control, only compatible with NORMSTAHL / CRAWFORD Rolling Code 433.92 MHz: EA433 2KM Micro | EA433 2KS | EA433 4KS | RCU 433-2 | RCU 433-4 | N002800 | T433-4. Sliding cover and film blue protector - With a sliding cover on the buttons to prevent accidentally pressing the button to open or close the door randomly. Supports 4 garage doors + red indicator light - This remote control can control up to 4 door or garage door openers + rolling code technology to protect access and connection to your home. Simple, easy-to-use mini remote control. 4 buttons - Fits well a bunch of keys, a pocket, a backpack hand and a backpack back, easy to carry carry it when you go out. Excellent after-sales service - If any problem occurs after purchasing the remote control, we offer professional after-sales service that will takes care of it in due time.