... time. b. It starts to work when plug in the socket, no clockwork spring necessary. When power off, it will stop ... battery will be shorted consumedly. But if with this timer switch, we can prolonging its life, and save the power ... , and waste the power, if we have this timer switch, we can turn on the heater at any time we ... TV, lighting on the gate etc. DL-TS004 125V 15A American mechanical timer switch