Features: The module adopts technology, which is of foreign trade quality and not need any driver. The downloaded data comes with its own application program, plug and play. Support WIN7, XP 32bit, 64bit system, easy to use. It can be apply to home intelligent switches control, hotel intelligent switches control, hotel intelligent electrical appliance control, shopping mall intelligent switches, company factory intelligent switches, Internet cafe timing management, karaoke timing control, Internet of Things, industrial control equipment, test equipment power control, street lamp management, intelligent management, centralized power management, etc. Onboards square USB interfaces, stable connection. Using imported high-performances USB control chip and special relays driver chip ULN2803, the relays works more stably. Two ways to access power supply is convenient and flexible. After connecting the power supply, the relays can remain set even if the computer is turned or USB is pull out from the computer. Specifications: Component:Plastic Input voltage: 12V. Input current: greater than 300mA. Connection modes: NC/NO Relays parameters:250V and 10A and 30V and 10A can be controlled. Size:Approx.96.8x72.2mm/3.81x2.84inch Package Includes: 1Pc USB Relays Module note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.