... , Heater etc Model No.: DL-TS004Description: Mechanical timer switch Brief introduction: DL-TS004 is a mechanical timer switch with 24 hours cycle ... time. b. It starts to work when plug in the socket, no clockwork spring necessary. When power off, it will stop ... when the power resume. If necessary, pls set the timer manually. c. It is mechanical timer, so minutes of error is possible ...