1) Offers charge and discharge protection, and prolong the service life of an accumulator. 2) In the absence of electricity, the system will automatically change into its armed state. When armed, this system doesn’t consume power, thus prolonging battery life and heat protection. 3) When the AC voltage is under 180V, the electric rolling door can’t be operated and will change its charging statement automatically 4) Overheat protection when the key components overheat. 5) Good design, advanced structure.