It was designed for extending function, which provides opening and closing, lighting control, self-locking protection and ventilation opening and other functions. According to the European-style wall switch size design, in line with the domestic common dimensions. Two-core wire installation, simple and convenient.“integrity-oriented, technical leadership, excellent quality, service supreme” As a safety device of motor, it can provide safety protection for people and obstacles when they are passing under the door. It needs to cooperate with this set of electrical control system.It can provide infrared ray to detect obstacles under the door, stop and reverse upward to ensure the safety of the door and the body when it moves down. (Designed with invisible light, based on the UL Safety Specification Test Standard of the United States) Payment Terms: 50% for deposit, 50% before shipment.(TT,Paypal ,L/C ) Package Details： Carton packaging ,one set one carton. Delivery： 25-30days after order confirmation . 1: How to confirm the quality with us before starting to produce? A: We can provide samples and you can choose one or more, and then we make the quality according to that. 2) Send us your samples, and we will make it according to your quality. 2: How to solve the quality problems after sales? A: Take photos of the problems and send to us After we comfirm the problems, within three days,we will make a satisfied solution for you. 3: What about the price? A: We promise the price we offer is lowest if same application, only to enlarge the market share. 4:What is your payment term? A:payment<=1000USD.100% in advance. Payment>=1000USD.50% T/T in advance,balance before the shipping.