Features ABS Material: the plate of the relay module is made of ABS, which has good wear resistance and insulation, as well as a long service life. Built in Chip Relay module built in stable USB to serial chip and microcontroller, serial debugging software can send serial commands to the computer to turn the 8 relays on and off, you can also send commands to the relay state of the serial port. USB RELAY MODULE: The relay module has a 5V supply voltage and supports USB power supply or external power switch. Long service life: with a long electrical life of 100,000 uninterrupted connections, this relay will meet your long-term use requirements. Safe to use: this relay module has over-current protection and relay diode renewal protection, making your use safer and safer. Specification: Item Type:8 Channel Relay Module Material: ABS, electronic components. Chip: Built-in 8-bit high performance microcontroller chip Supply voltage: 5V, support USB power supply or external power switch Output type: relay switching signal Package list: 1 x 8 channel relay module. Note: Pay attention to safety. Package List 1 x 8 Channel Relay Module