The Karcher BV5/1 backpack vacuum is suitable for dedusting, absorption of normal types of dust or dry vacuuming between seat rows (theatres, cinemas, festival rooms), in corridors (between storage racks), on stairs or scaffolds, in stores, trains, buses and airplanes. The Karcher BV5/1 vacuum can be run on batteries where access to a power supply is not available. The batteries can be recharged and ready for operation in 1 hour. http://www.building-supplies-online.co.uk/karcher-bv5-1-backpack-vacuum-cleaner.html?___SID=U