With the progress of science technological audio product is getting more and more, it is too inconvenient if these products combined together, many sockets will be installed for them. Time series equipment is available to turn on/off the electric equipments connected according to the orders by the mode form first to last one when turning on, and from last on to the first when turning off to avoid some damage of the terminal instruments (eg. Amplifier or speakers...etc) because of the incorrect operation and also reduce the rushing electrical current which is caused to the lines of the power transmission when the electrical instruments turning on. As the function of this instrument, some managers of the system can never touch the ON/OFF switch of the power. It is an essential instrument for an audio system, conference system, broadcasting and other electricity engineering