Package List: you receive 4 pieces of garage door opener remote control compatible with M12 garage door remote transmitter for automatic swing sliding door opener, wireless transmitter keychain security door controller, meet your use needs and operate well. Compatibility and Control: compatible with M12 garage door remote transmitter for automatic swing sliding door opener,one of 4 button wireless controller keychain security door controllers can operate countless door openers contemporary within control range and control multiple door operators separately, four swing door openers, one sliding door motor, two swing door openers,one sliding door motor, control two sliding door motors by adding two erm12 on each control board respectively, etc. Safe and Reliable Operation: our garage door opener remote control kit is carefully designed and tested, with lowest power consumption to long battery life (built in dry battery); Adopts RF technology and secure encryption, and use range can