... direct current electrical engineering device, for steadier operation, low door opener: 220volts/110volts, 800Nm,1000Nm,1200Nm.Features:1) ... Fully electronic, easy and simple to set up3) Door opening is controlled by motherboard4) Memory function remembers last ... , an emergency handle can be used to open or close the doorPacking: carton sectional garage door opener, door motor,industry door opener