Feature:1. This is USB controlled relay board with 2 channels. Military grade PCB board production.2. Adopting for HID technology, so no need to install any driver in for windows system and you can easy to use.3. The relay can control the maximum voltage , 10A AC load and 30V, 10A DC load.4. Use the high-performance USB control chip, on-board square USB interface, stable connection.5. Support for WIN7, XP 32-bit, which is easy and convenient to use.6. Small size and lightweight, with stable performance.Specification:Condition: 100% Brand NewItem Type: Relay ModuleColor: As shown in the picturePCB Size: Approx.56.5x40.6mm / 2.2x1.6inFixed Hole Size: Approx.3mm / 0.12inFixed Hole Center Moment: Approx.52.2x36.6mm / 2.1x1.4inControl Terminal Connection Mode: NC / COM / NOPackage List:1 x Relay ModuleNote:1. Please allow 1-2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.