The four buttons can copy four different types of chips respectively. It is a remote control that can serve four types of installations, which can save you a lot of money. Using chip technology radio frequency, transmission distance, no direction, high sensitivity transmission, no signal blocking 433MHz, transmission distance of 50-100m (open space), giving you a new experience of remote control and much convenience in your daily life High precision copying and high copying efficiency, easy to install and use 4 channel radio control device for cars, car roofs, garage doors, gate doors, alarm systems, heating systems, home automation, etc.