A Grinding Noise from the Built-in Copper Gear During Using Will Be Normal.Versatile Use:The power scrubber can be widely used to clean tiles, tubs, sinks, fish tanks, walls, baseboards, windows, doors, corners, bathrooms, kitchens, toilets, cars, etc. Also, it can be utilized to polish or oil sofas, leather shoes, wooden walls, etc.Portable Cordless and One-second Replacement Patented Design: Powered by 3.7V 2600mAh battery, the spin scrub can last continuously more than 1 hours after only 2.4 hours fast charging. The cordless portable design is convenient for you to use it no matter indoors or outdoors. No need to worry about the trouble of cleaning without a power outlet. One-second replaceable magnetic brush head design allows you to replace the brush head soon, which helps you clean different places quickly.IPX7 waterp/roof and S/afe Design:Unlike other products, the superior sealing design enables the spin scrubber work in the water for a long time without being damaged. Besides, the copper gear structure and automatic power-off function greatly improve the life span. Tool-free Extension Handle Design:spin scrubber allows you to quickly adjust the length from 10 to 28 inches, which helps you easily clean the hard-to-reach places. Especially suitable for people with back pain and arthritis. The ergonomic grip and hook slot design are additional surprises.6 Pack Magnetic Brush Heads:Extra-wide flat brush head is used to clean large flat surface area; small flat brush head is ideal for cleaning smaller object; corner scrubber brush head is great for tight places ; scouring pad head is ideal for dish washing and household chores; wash sponge head is perfect for vehicle cleaning and polishing; chenille mat head helps to keep the car or window dry