Features: 1.Onboard square USB interface, stable connection. 2.Use imported high performance USB control chip. 3.Use the special relay drive chip ULN2803, the relay works more stable. 4.Military-grade PCB board production. 5.Board power socket and terminal, two ways to access the power supply are convenient and flexible. When the power is connected, the relay can remain set even if the computer is turned off or the USB is unplugged from the computer. specification: Onboard square USB interface, stable connection. Use imported high performance USB control chip. Use the special relay drive chip ULN2803, the relay works more stable. Military-grade PCB board production. Board power socket and terminal, two ways to access the power supply are convenient and flexible. When the power is connected, the relay can remain set even if the computer is turned off or the USB is unplugged from the computer. Adopt for HID technology, no need for any driver, plug and play. : Input voltage: DC 24 V Input current: greater than 300mA Wiring method: NC/COM/NO Can control AC 250V, 10A AC load and DC30V 10A DC load Relay Size: approx. 71 * 71 * 15 mm/ 2.8 * 2.8 * 0.6 in Product Weight: 66.1 g / 2.33 oz Package list: 1 * Relay Module