With the WV 6 Pr + KV 4 Premium White you can easily and quickly clean windows and other surfaces without streaks. You use the vibrating cleaning cloth to soak windows, but also to remove stubborn stains from your hob, for example. Is the mop cloth dirty but do you want to continue cleaning? Then grab the extra cloth so that you can continue as usual. It does not depend on how long the battery lasts, because it works for up to 45 minutes. Enough time to take a good look at the windows.