This is a router UPS module. You can run your ONU and router using any 12-volt battery or solar battery. If there is electricity, the ONU and router will run directly from the power supply. If the power goes out, it will automatically switch to the battery without restarting. This will not charge the battery; the battery must be charged with a separate charger. Depending on the battery's ampere, you can get backup for 1 to 2 days even if there is no electricity. If you want to buy it, contact me via inbox or phone number.