Garage door opener Features 1,Quiet and stable operation. 2,Self-locking in closed position. 3,Manual release device in case of power failure. 4,Auto-reverse in closing in the event of obstruction. 5,Auto-stop in openning in the event of obstruction. 6,Automatically close the door after 45 seconds. 7,Wiring terminals for button switch and infrared photocell. 8,Plug type antenna is provided. 9,Courtesy light will turns on in using and turns off after 3 minutes.And the remote distance up to 30 meters. ************************************************** Technical Specification Power supply:AC220V+/-10%,50Hz Motor type:Permanent-magnet DC motor Lift height:3m Auto-close time:45seconds Unit weight 7kg Measurement:400*210*160(mm) Opening speed:5.77m/min Model:CMJ-L600(Round Rail 60CM*5PCS)/CMJ-L1000(Square Rail 330CM*1PCS)