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 normally closed switch and 3.4.5 are connected as dual control switches.Materials: This timer relay is made of 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