1\ Adopt the microchip from America,rolling code technique, be sensitive for control and high  secrecy.

2\ Steady frequency design on transmitter .Automatically break off the power when out of operation to save energy.

3\ With studying pattern technique in compiling code , easier for adding or recruiting transmitter.

4\ Operateing status is easily shown with indicator lamps of power and setting respectively .

5\ With inside pin for transforming between opened-alwasys and closed-always , convenient for the choice of permanently opened or closed to fit for connecting to various electric device.