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