Powerful built-in rechargeable Ni-MH batteries 4 V 2 Ah. The vacuum is suitable for all PureSpas and for above-ground pools up to 18' (5.49 m) in diameter. Debris container capacity 0.21 gal (0.8 l). 12 gal/min (45 l/min) – water suction rate for efficient debris collection. Lightweight 2.39 m telescopic aluminum pole included. Two interchangeable brush heads. Automatic shut-off function when the vacuum is not submerged. Charging time 5–6 hours / maximum run time 50 minutes.