Features Easy Operation: When the signal gets the set times, the relay is closed, which can connect to the alarm, and you need to manually press the middle reset button before disconnection. Equipped with NPN and PNP Signal Input Ports: The automatic detection counter is equipped with NPN and PNP signal input ports, which can be flexibly connected to the power supply, buttons, etc. Wide Range of Counting: Electronic digital counter have a wide range of counting from 1 to 99999, and digital counter becomes easier to count. Widely Used: Industrial control counter adopts precise manufacturing technology and sensitive elements, with a stable and reliable structure, which can be widely used in equipment upgrades and DIY. Easy to Install: The counter has excellent workmanship and selected materials. It has strong and durable characteristics. It is very convenient to maintain and install, and also saves time and energy. Specification: Item Type: Digital Counter Product Model: YF-16 Input voltage: 5~24V DC, 5~24V AC (all available).  Counting Range: 1~999999 times Wiring Port Instruction: 1. AC DC +, -: Input power;  2. NPN: NPN signal input terminal; (can connect to power supply negative pole, button, sensor trigger, etc.) 3. PNP: PNP signal input terminal; (can connect to power supply positive pole, button, sensor trigger, etc.) 4. Output: The output is the passive contact switch value of the relay.  Package List: 1 x Digital Counter Note: Be careful not to let the product work in rain or damp environment, and please make sure the cable is connected before use. Package List 1 x Digital Counter