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【Components】 USB relay control switch contains onboard LED power indicator and relay status indicator.Power converters are able to control various appliances, and other equipments with large current 【High Quality Components】 Adjustable delay relay board with usb contains onboard high-performance microcontroller chips and onboard CH340 USB control chip 【Over Current Serial port control relay module is with over current protection, pull-up and filter circuit designed mode terminal block, strong ability of anti-jamming, suitable for industrial control 【Military Grade Double-Sided Circuit Board】 USB control relay module is brand new and high quality. USB control relay board adopts military grade double-sided circuit board.Channel Relay interface board OF external trigger relay board with USB, and each one needs driver current 【Applications】 USB control relay board supports MCU control, The industrial field, PLC control, Smart home control. Indication LED's for Relay output status