The RamFan UB20 (12V) w/Battery Pak System includes UB20 (12V DC), Battery Pak with Built-in Charger, Battery Clips. RAMFAN Battery Pak with dual high-low speed control to quickly purge the area then maintain fresh air for the entire work shift. Power fan for 2.5 hours on high setting or extend up to 8 hours on low setting. Built in charger to fully recharge in 12 hours. Alternatively, the fan can be powered by a vehicle battery with supplied connectors.