Features of product: Garage door opener which is an intelligent control system and widely applies to all kinds of garage door. It is simple for installation and operation. (1)It can be identified minimal obstacles in any position when the garage door operation. (2)the reduplicate coding rate of rolling code system is only one ten billions. (3)meanwhile it can be adjusted to the overload force when the door switching. (4)automatic lights that automatically close (5) soft start &stop. We have avhieved ISO9001. Technical Parameter: Pull and push force (N): 600 / 800 /1200 Track model: G21/G24/G27/G30 Track length(mm): 2900/3200/3500/3800 Lift height(mm): 2100/2400/2700/3000 Technical Features Soft start/stop Accurate positioning and adjusting Super quiet Running Automatic lighting Photo Eyes Connection / infrared ray protection Digital display Error Recognition Menu guide operation Memory Protection for power cut Automatic Error Recovery Rolling Code Remote Control Anti-thieft joint Storage battery joint