Welcome to our store! 1. Built-in square USB interface, stable connection. 2. Use imported high-performance USB control chip. 3. Military-grade PCB board production. 4. Use HID technology, no need for drivers, plug and play. 5. Supports WIN7, XP 32-bit, 64-bit systems, easy to use. Features: r 1. Built-in square USB interface, stable connection. r 2. Use imported high-performance USB control chip. r 3. Military-grade PCB board production. r 4. Use HID technology, no need for drivers, plug and play. r 5. Supports WIN7, XP 32-bit, 64-bit systems, easy to use. r r Specifications: r Voltage: 5V r The relay can control 250V, 10A AC load and 30V, 10A DC load r Supported systems: WIN7, XP 32-bit, 64-bit systems r Control terminal connection method: NC/COM/NO r Mounting hole size: 3mm r Center distance of mounting holes: approx. 52.2 * 36.6 mm / 2.06 * 1.44 inches r Relay size: approx. 6.2 * 4 * 1.5 cm / 2.44 * 1.57 * 0.59 inches r Product weight: approx. 32.5 g / 1.15 oz r r Packing list: r 1 * Relay module If you find any problems with the product after receiving the goods, such as damage and incorrect quantity, please contact the seller immediately. We will do our best to provide you with satisfactory after-sales service.