The battery backup sits between the utility power (power from the wall outlet) and the parts of the computer. In other words, the computer and accessories plug into the battery backup, and the battery backup plugs into the wall. UPS devices come in many shapes and sizes but are most commonly rectangular and freestanding, intended to sit on the floor near the computer. All battery backups are cumbersome due to the batteries located inside. http://www.cell2power.com/backup-battery-unit/