The WV 50 cordless window vac helps to clean glass surfaces, mirrors and other smooth surfaces faster, more easily and more thoroughly. This unique appliance combines a water vacuum with a double squeegee and is used after the surface has been sprayed and wiped down. Dripping water is removed from the surface immediately, no streaks or spots are left. Weighing only 700 g, it is powered by a rechargeable lithium-ion battery. The running time per charge is about 20 minutes, which is sufficient to clean a surface of 25 to 30 m² or ten to 15 windows.