Onboard high-performance micro-controller chips.Onboard CH340 USB control chip.Onboard LED power lights and relay status LED lights.Onboard 5 v,10 A / 250 VAC,10 A / 30 VDC relays,relay's long life can absorb 100000 times in a row.Module with over-current protection and relay diode current protection function. Colour:blueMaterial:metal PCB size: 49.6 (mm) x16 (mm)USB switch the default communication baud rate: 9600 BPSUSB switch communication protocolData (1) - startup logo (the default is 0 xA0)Data (2) - switch address code (the default is 0 x01, identifies the first switch) Data (3) - operation data (0 x00 to "off", 0 x01 to "on")Data (4) - check codePackage included:1 x LCUS - type 1 USB relay module USB intelligent switch controlNote: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.