Features: brand new and high quality This module complies with international safety standards, and there are isolation slots between the control area and the load area. Use genuine relays. With power supply and relay action instructions, the light is on when it is on, but it is not on when it is off. When there is a signal at the signal input terminal, the common terminal and the normally open terminal will conduct. It can be used as a single-chip development board module, and can be used as a home appliance control. Specifications: Product Name : 8-Channel Relay Module Output Channel : 8 Power Supply : 5V Material : Electric Part Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1 x 8 Channel Relay Module