... code technology 4, Safety auto-Reverse 5, Manual Conversion Roll up door openers1, Inpout Voltage : AC230/110V selectable2, ... , Quiet operation and reliability, Drive unit housed within the roll ,hardwearing #66 nylon gear mechanism no lubrication required3, Power ... , Waterproof function19, Easy installation20, OEM, ODM is welcomed. Roll up door openers, roller door operator, roller door control box ...