Specification: Origin: Mainland China Type: Relay Condition: New 1. Control area and load area have isolation slot. 2. With power supply and relay action indication, light up when it is closed, not light up when it is broken. 3. When there is a signal at the signal input, the common terminal and the normally open terminal will be on. 4. Can be used as a microcontroller development board module, can be used for home appliance control. 5. Control DC or AC signal, can control 220V AC load. 6. There is a normally open and a normally closed contact. 7. Blue KF301 end of the control line is more convenient to connect. Product size: 40*18*15mm/1.57*0.71*0.59in Cautions: 1. High-level trigger refers to the signal input and ground voltage between the trigger mode, can be understood as the signal input and VCC positive short circuit trigger kind of party. 2. Low-level trigger refers to the signal input and the voltage between the ground and OV trigger mode, can be understood as the signal input and GND negative short circuit trigger a way. 3. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Power Relay Module 1. Isolated control and load areas: This 5v low level trigger relay module shield features isolated slots for control and load areas, ensuring better safety and reliability during operation. 2. Power and relay status indicators: With bright LED indicators, this interface relay power board shield provides clear visual confirmation of power and relay action status, making it easy to monitor during use. 3. Signal input mechanism: This module has a signal input mechanism whereby when there is a signal at the input end, the common end and normally open end will be connected. 4. Versatile applications: This relay module shield can be used as a development board module for single-chip microcontrollers and for controlling household appliances, providing versatility in use. 5. Convenient control wire connection: The blue KF301 terminal makes connecting control wires more convenient, helping streamline the installation process.