Powerology 4000mAh Multi Surface Self, Cleaning Vacuum, 0.72L Clean Water/Sewage Tank Capacity, 30, 40 Minutes Battery Life, Seamless Water Absorption, 4000mAh Battery Capacity, Charging&Drying Dock, 8000Pa Max Suction, Charging Time (4 hr), Self, Cleaning Mode, <78dB Noise Level, 250W BLDC Motor.