Yes, you can use a UPS (Uninterruptible Power Supply) with a printer or router.
A UPS can provide backup power to any device that is connected to it, including printers and routers. This can be especially useful for devices that need to remain powered on, such as a router that provides internet access or a printer that is in the middle of a print job.
When choosing a UPS for your printer or router, make sure to check the UPS's specifications to ensure that it can handle the power requirements of the device. Some devices, such as laser printers or high-end routers, may require a UPS with a higher wattage or VA rating to provide sufficient backup power.
It's also important to note that some printers and routers may draw a lot of power when starting up, so you may need to take this into account when selecting a UPS. Additionally, some devices may not be compatible with all UPS models, so it's important to check the manufacturer's recommendations before making a purchase.