Features: 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. Specification: 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 【High Performance Uln2803 Chip】Using imported high performance USB control ULN2803 chip,the relay works more stable 【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】Input voltage: DC 24 V,Input current: greater than 300mA,Relay Size: approx. 71 * 71 * 15 mm/ 2.8 * 2.8 * 0.6 in,Product Weight: 66.1 g / 2.33 oz 【High Quality Military Grade Pcb Board】Military grade PCB board production 【Easy to Use】Adopt for HID technology, no need for any driver, plug and play