Remote control for your door opener. 303/315/433/868 MHz. Rolling code. ABOUT ETDOOROperating since 1998,we ETDOOR, ... to make home-access more convenient along with security.With 433.92MHZ frequency,rolling code and four channels,easily programmable.Drive straight ... in the car.Other Models Of Door Openers:CE Certificates: Transmitter,remoter,remote controller