Switching function: supports 16 groups per day on/off, one button automatic, can be set to cycle day/week.Two-way control design, 3.4 is a normally open switch, 3.5 is a switch normally closed and 3.4.5 are connected as dual control switches. High-quality materials: This timer relay is made of high-quality durable hard plastic materials, rust-free, anti-corrosion and high strength for maximum durability.The surface is smooth and burr-free, and the hand feels delicate and comfortable.Manufactured under strict quality control standards, the improved design can extend the service life. Application:The timer switch can automatically turn on and off different types of electrical equipment on a fixed schedule.Advanced preset one week before, DIN rail installation.This timer relay widely used to control lamp, water heater, sprayer, bottler, preheater, agricultural installation, broadcast equipment, home appliance, etc. High precision: this built-in 1.2V/40mA point rechargeable timer relay, high precision, industrial grade chip, strong anti-jamming, using 8-bit industrial grade chip, small error, high stability, travel time accurate, daily travel time error is less than 2 seconds. Superior Performance: With built-in high-performance batteries as backup power, it can maintain time display and store data for more than 6 months when disconnected from the mains.The control circuit time and the charging circuit are separated from each other.Passive output at the output can also be used for signal control. Note: The data are all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.