Digital Timer Thumbwheel 3Digit With Size 96 x 96mm (MI-DT3) keep track of timing, to trigger an action, to start timing once triggered by an action, or both. They are typically connected to electrical circuits powered via the main supply. A timer is a specialized type of clock used for measuring specific time intervals. The timer can be used to measure the time elapsed or the external events occurring for a specific time interval. They are used to maintain the operation of the embedded system in sync with the clock. 

• switches can be used to turn lights on or off at times selected by the user.