... door operator, rolling garage door opener 2, 24V DC motor drive unit 3, Rolling code 4, Safety auto-Reverse ... opener 1, Inpout Voltage : AC230/110V selectable2, Motor Type : 24V DC motor , Quiet operation and reliability, Drive unit housed ... box and will sound continuously whilst door is in travel and problem is there17, Back Up Power : interface ... , roller door operator, garage door opener dc motor