Skylink DM-150 Swing Door Opener with Electric Strike Can be installed on most doors, including wood and metal doors. "Hit and Stop" feature ensures safety operation. Fail safe operation - Door can be open/close freely during power outage Optional Audio warning as an indication when the swing door opener is operating Can learn up to 16 remote controls Can be installed on most doors, including wood and metal doors of up to 100 Lbs and no more than 42 inches wide. "Hit and Stop" feature ensures safety operation. Fail safe operation - Door can be open/close freely during power outage Optional Audio warning as an indication when the swing door opener is operating Can learn up to 16 remote controls