You sure you will not be at home when you are out and no one in the house. Even if someone in your home is to wait 10 to 15 minutes and it was heavy and hard to be able to pull one book store in the chain pulley. 
opening by pulling the chain pulley will do shorten the life of the mechanical system of electric motor and sometimes it was damaged in the middle when you are not at home. 
blackouts all day when you're home alone and suddenly have the urgent need to go out soon but how to be able to get this close.

Let's book The Power Save "your solution"

FEATURES OF EQUIPMENT

+ When the grid voltage range from 170V - 240V machine will automatically connect to the grid and store the battery charger.

+   When power loss or voltage drop below 160V machine will automatically switch to the door using the power generated from the plant (grid voltage drop below 160V is considered lost power).

+ Use the dedicated processor chip.

+ System overload protection and short circuit.

+ System protects batteries when low battery voltage.

+ Use high frequency transformer for high efficiency energy saving.

+ System battery charger intelligent charging for 13 hours at 90% average capacity battery.

+ Sockets Multi-function output is compatible with all types of plug key.

+ Use average dry battery without maintenance.

+ Designed for professional use electric motors for rolling shutters.

Installation:

- Mounts in racks with dedicated machines.

- Put the plug in the drive of the book's Motor 220V OUTPUT hip machine.

- Insert the plug of the LD 900 to 220V power outlet.

- Switch on the front of the machine to the ON position.

LED indicator on the machine:

LED lights on the machine with 03 different bright colors correspond to the operating status of the machine Save electricity:

- Blue: informed and active machine is powered shutters.

- Yellow: battery notification is being loaded, the battery light stays green no.

- Red: battery warning out or overloaded.

Note:

- Installation in dry and ventilated place, avoid damp places, water.

- When used regularly plugged into the electric grid.

- Machine does not have to use the power switch. For the first month of storage to plug about 11 hours to recharge the battery maintenance.