Features 1、[COMPACT SIZE] 8 channel relay module, which has compact structure, easy to install and does not take up space. 2、[WITH OPTOCOUPLER] Onboard EL817 optocoupler, with optoelectronic isolation, strong interference resistance ability. 3、[GOOD DURABILITY] Onboard 5V, 10A/250VAC, 10A/30VDC relay, with a long life and can be continuously pulled in 100000 times. 4、[EASY CONNECTION] The relay module can be directly connected to the microcontroller I/O, and has output signal indication. 5、[SAFE OPERATION] The relay control board has diode freewheeling protection for safe operation and short response time. Specification Item Type: 8 Channel Relay Module Material: Resin Working Voltage: 5V Working Current: 10A Size: Approx. 79.5 x 71mm / 3.1 x 2.8in Package List 1 x Relay Module