Features: *Easy to install and combine with the transmitter,with a hook on the transmitter,very convenient to use. *Wide using scope, it can connect to the electronic control lock,garage door, light, automatic door/window, household appliances for security system, etc. *High receiver sensibility. You can connect or disconnect the receiver to the transmitter within a distance of confidence. *Super small size, taking up very little space.The receiver board size is only about 4*4*2.6cm. *Stable and reliable, stable performance.Can pass through walls, floors and doors, control receiver from any place within a reliable distance. *Learning pair code: it can work with any remote control with the same frequency, so you needn't worry about losing remote control any more. (If the remote control is lost, buy one and pair with the PCB board is OK.) Receiver