Electric Window Opener Single Chain Window Actuator with rain sensor and remote control optional ,Long Lasting

1. The chain can bend unidirectionally. It stretches out while open window and retract to opener inside after closing window 2. Double layer chain, more durable and not easy to break off. 3. Equipped with overload protector and can open and close for 20000times. 4. Smart design with strong funciton. 5. Locking force reach 2000N. Push/Pull force 450N.