The standard of the stage chain electric gourd standard has a rotating limit switch, which makes it easier to adjust the gourd. The rotating limit switch is convenient for fast resetting and limited positions. At the same time, it is easy to adjust the limit function. It can preset any up and down position in the chain length range. It only needs to gently dial the small paddles of the limited position, and you can repeat the different positions multiple times. Easy to learn, easy to use. The British Pigeon Brand Circle Chain Electric Gourd Modeling method produced by the company is: Lifetime maintenance. Any issue within one year of the warranty period shall be responsible for the manufacturer. The maintenance period of the warranty period only charges only the cost of parts and components, and does not charge any cost. Against the warranty policy for manufacturing and production industries. The specific situation can be communicated at any time.