Description: JL-ECRD DC rolling door motor is "Jie long" new product series, design and produce in accordancewith the construction industry standard of Q/ZJLJ11-2010 electric rolling door motor enterprise standardstrictly, The DC motor should be installed with electric control system, Normally it can be used byelectric power, transmit to DC for motor drive. lf the power off, the control system automatically switchfor its built-in battery supply for DC motor, so you can also drive the door open and close easily.