SMAKN&reg; LCUS-1 type USB relay module USB intelligent control switch USB switch USB intelligent control switch. Onboard high-performance micro-controller chip. 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).