Features Professional timer control: Perfect for controlling school or factory bells, providing and reliable timing control for various applications. Convenient installation: Easily mountable on a DIN rail, ensuring a hassle-free and secure installation process. Customizable ringing time: Set the ringing time from 1s to 99s, offering flexibility to cater to specific timing requirements. Space-saving design: Compact and portable, this timer switch efficiently saves space while delivering powerful performance. High precision and reliability: Equipped with a high-quality chip, ensuring strong anti-interference and delivering accurate and reliable timing control. Features: 1、The Timer Switch is mainly used for school bell or factory bell control. 2、Din rail-mounted method, easy to install. 3、Ringing time can be set from 1s to 99s. 4、Compact and portable time switch, saves space. 5、High precision, high quality chip, strong anti-interference. Specification: Item Type: Timer Switch Function: Bell Time Control Minimum Setting Time: 1min Working Voltage: 220V 50/60Hz Timing Error: ≤1s/d Rated Operating Current: AC-15 220V 3A Thermally Stable Current Value: 16A Ringing Time: 1s~99s Installation Method: Din Rail Type Package List: 1 x Time Control Switch 1 x English Manual Package List 1 x Time Control Switch 1 x English Manual