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This USB Watchdog does not require any software. Simple plug and play installation with 2 wires connecting to your Hard Drive LED outputs on the motherboard and another 2 wires connecting to Reset Switch ports on the motherboard. When the system hangs or bluescreens, this device will sense no Input/Output to your hard drive or SSD drive and will execute system Reset within the time preset by you from such event. This device is safer than typical software based USB watchdog. This allows the system to complete any core dump or self-restart processes before hitting the Reset switch. Previous relay versions would enter a reset loop causing extensive downtime. This is great for restarting unattended servers, storage servers, GPU miner, or any other PC based device. Please make sure you specify INTEL or AMD based motherboard as their signaling is slightly different. One Year replacement and phone support available. Specifications: Color: green Size: 60 * 24 * 4mm/2.36 * 0.94* 0.16inch line length: 340mm/13.39inch Interface Type:USB Wiring Instruction: White line: motherboard restart pin (-) Green line: hard drive indicator light (+) Black line:hard drive indicator light(-) Red line: switch indicator light (+) Package Included: 1 x Hardware WatchDog