Soft start and soft stop Electronic limit switch Safety reversing sensor Chain (Belt) drive and super-quiet Manual release handle in case of power failure Alarm system/ Photo eyes/ Wall switch/ Battery backup can be added Motor: 20,000 cycles testing, with tin bronze gear--More durable Transformer: including resettable fuse--Safer Control board: with 63V capacitors, resisting high voltage--Securer Enclosure: abs and pp plastic material, high strength--Tougher