American mechanical timer switch 1.Min:15 minutes, Max: 24 Hours ... .: DL-TS004Description: Mechanical timer switch Brief introduction: DL-TS004 is a mechanical timer switch with 24 hours cycle design, minimum ... the battery will be shorted consumedly. But if with this timer switch, we can prolonging its life, and save ... waste the power, if we have this timer switch, we can turn on the heater at any time ...