4 in 1: The four buttons can copy four different chips respectively. It is a remote control that can operate four different devices, saving you a lot of money. High Sensitivity: Using radio frequency technology, long transmission distance, no direction, high sensitivity transmission, no signal blocking. Long distance: 433MHz, the transmission distance is 50-100m (open space), which brings you a new remote control experience and brings great convenience to your daily life. [High copy efficiency]: High copy accuracy, high copy efficiency, and easy to install and use. Wide Application: 4-channel radio control machine for cars, car roofs, garage doors, gates, alarm systems, heating systems, home automation, etc.