Karcher’s B 40 W Bp (Brush Assist Base Unit) battery-operated, walk behind scrubber is the most versatile, full-featured scrubber on the market. The B 40 unit features a D51 Disc Scrub Deck with cleaning paths of 20 inches with a Tank-in-Tank system that gives the operator full access to the water recovery tank making the unit suitable for stripping floors and maintenance friendly. 

The B 40 is engineered for more efficient use of resources. Karcher's Intelligent Key (KIK) system enables the facility manager to create a unique cleaning profile, making it easier to train users and operate the scrubber. The KIK system can be used to set varying levels of authorized access by means of three color-coded keys: yellow, grey, and red; for operators, facility managers and technicians, respectively. Facility managers can set parameters such as travel speed, brush speed, motor output or cleaning agent dosage to suit the needs of the cleaning task. An operator's key carries out the pre-determined settings, needing only to select their desired cleaning program from a rotary switch. As a result, only the required amount of energy and cleaning agent is used. This system practically eliminates operating errors. 

The operator only needs to insert the key. Only the coded key pertaining to the machine allows the machine to be started up, and is therefore a technical solution to unauthorized operation.