Model Name: Intelligent Back Machine Product size 28.8*14.3mm/11.34*5.63 inch Battery capacity: 2600 mAh Rated voltage: 7.4v Charging time: 3.5 hours Gear: 3-speed adjustment Waterproof rating IPX7 Applicable people: women with delicate skin and the need for a beautiful back Description Ergonomic design: Adjustable up and down, easy to use no matter how tall or short you are, ensuring that every corner of your back is effectively cleaned. Long-lasting battery life: Equipped with a high-capacity 5200 mAh battery, it can support long-time use after a single charge, reducing the trouble of frequent charging. Multi-Speed Adjustment Function: 2 speed adjustments to meet the needs of different skin types, from gentle to powerful, users can choose the most suitable cleaning mode according to personal preference. PREMIUM WATERPROOF PERFORMANCE: IPX7 waterproof design makes this back shower brush not only safe to use in the shower, but also can be rinsed directly with water, convenient, hygienic and easy to maintain. EASY INSTALLATION: Made of strong environmentally friendly waterproof adhesive, no need to drill holes, easy to install with one button, one-button operation for start/stop function when in use, simple and smart. Product List Bath machine*1 Brush head*4 Backplate*1 Data cable*1