Automatically power off and restart every 72 hours, which can greatly improve efficiency of network bandwidth utilization, thereby avoiding network congestion. DC5.5x2.1mm Interface, Male head connect to power interface of router/optical modem, Female head connect to adapter power supply. Support 5V-15V power supply. In , it supports all DC5V 9V 12V 15V devices, such as: network routers, Fiber Modem, optical cats, no restrictions on . Operation method:1.Connect your router/optical modem/other DC voltage product to this product, and then connect your device power adapter cable. 2.The time to start counting when power is on, the default is 72 hours, fully automatic cycle For example, if you need it to automatically restart at 00:00 every night, then turn it off and on again at 00:00. It power off/on every 72 hours. Connection instructions: 1. -on: indicator light flashes and then enters working state 2. Restart interval: 5s-30s 3. Timing time: start timing after power-on, automatically power off and restart every 72 hours Note: If there is an unexpected power outage during normal operation, the timer start again after call Color: Black Material: PVC Package Contents: 1 x Router restart line Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.