 It operated on rechargeable Nickel-Metal Hydride (NiMH) battery, comes with a docking station(home base), power adaptor, remote control and a spare filter.The robot would return for recharge automatically whenever it finished its job, the battery level is low or anytime commanded to return with a remote control.Since Metapo first launched the US version of the robot called Infinuvo QQ1 in the US market sometime in 2003, it has undergone several upgrades including 3 major ones.