The four buttons can copy four different chip types at a time. This is a single remote control that can control four types of structures, saving you a lot of money. Adopting radio frequency technology, the transmission distance is non-directional, highly sensitive, and the 433MHz signal is not blocked. The transmission range is 50-100m (open space). This brings you a new remote control experience and great convenience to your daily life. High-precision copying and high copying performance make this 4-channel radio control system easy to install and use, suitable for cars, car roofs, garage doors, gates, alarm systems, heating systems, home automation, and more.