Package List: you will receive 20 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 the 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 the lowest power consumption to ensure long battery life (built in dry battery); Adopts RF technology and secure encryption, and the use range can reach 200 feet; Rolling code technology minimizes radio interference, encryption prevents intrusion, providing safety and security for your property. The black garage door remote control is compatible with the M12 garage door remote transmitter, operating at 433.92MHZ, with clear instructions and simple programming; Please make sure the garage door opener is completely closed before starting remote programming. Convenient and Portable: the small and lightweight keychain remote switch is easy to carry and can be put into handbags, wallets, pockets, etc., without taking up too much space; The keychain remote control with strong signal transmission has a wide coverage, is convenient and flexible, and brings you convenience; Please follow the information before purchasing. Note:Due to different production batches, the color may vary, which d