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*USB intelligent control switch. *Onboard high-performance micro-controller chip. *Board CH340 USB controller chip. *Onboard Power LED and relay status LED. *Onboard 5V, 10A / 250VAC, 10A / 30VDC relay, relay life long continuous pull 100,000 times. *Relay modules with overcurrent protection and freewheeling diode protection. *PCB Size: 47.6 (mm) x16.4 (mm). Feedback: We greatly appreciate your POSITIVE feedback. Please do NOT leave negative feedback without asking for help. Our aim is to provide Top Level Customer Service, so we will try our best to solve any problem.Thank you very much!