Feature: 1. Commonly used in scenes such as delay switch, counting, counting, access control, car reversing video, car circuit modification, etc. 2. The power supply is protected against reverse connection, which is safer and increases the service life of the product. 3. With power indicator and relay status indicator LED lights, and the digital display can display up to three digits 999. 4. Made of high‑quality materials, strong and durable, has a long service life. 5. With small size, easy to carry and store, convenient to use and with good performance. Specification: Item Type: Relay ModuleMaterial: PCB Service Life: ≥100,000 times Pulse High Level Requirement: ≥DC5V Pulse Low Level Requirement: ≤DC1V Pulse Frequency Range: 0 -10KHZ Pulse Signal Current: ≥25mA Product Function: (Long press the K3 button for about 2 seconds to enter the adjustment function) P-1: Pulse Detection: The pulse relay is always closed within T time, and no pulse relay is disconnected after T time P-2: Motor Stop Alarm: No detection when power on, the first pulse is detected, and the pulse relay has been disconnected within T time, otherwise the relay is closed P-3: Pulse Trigger Reversal: Give a pulse signal, the relay state reverses P-4: As long as a pulse signal is detected, the relay will be closed and kept closed until the module is powered off. Package List: 1 x Relay Module