Application: Din digital timer widely used to control lamp, water heater, sprayer, bottler, preheater, agricultural facilities, broadcast equipment, home appliances, etc. < p>High Quality: The programmable digital timer housing is made of high quality durable hard plastic for durable use and long lifespan, built-in 1.2V/40mA rechargeable point, high precision chip, industrial grade, anti - jamming Function: The timer can automatically turn on and off various types of electrical equipment according to the set time. Preset: advanced preset one week earlier, installation DIN rail Refresh Data: The timer switch has built-in high-performance batteries as backup power, it can keep the time display and store data for more than 12 months in case of network disconnection Instruction: 1, When you use the timer switch for the first time, enter AC and charge the built-in battery please, then press the reset button. 2, the switch The timer is in 24 hour mode by default. Press and hold the "time" button (next to "reset") for 5 seconds until it displays "AM" to enter 12 hour mode. Press and hold the "time" button again for 5 seconds to return to 24 hour mode.