product description 300ML Detachable Water Tank & Waterproof Design:300ml Upgraded Water Tank Design for Uninterrupted Oral Dental Flossing. Without Filling the Water Multiple Times. Detachable Water Tank Allows You to Thoroughly Clean the Limescale Inside.The Cordless Water Pick Specially Designed With Internal and External Double IPX7 Waterproof Protection, More Safe to Use for Shower in the Bathroom.IPX7 waterproof design is adopted for both internal and external of the machine to provide dual protection, which prevents leakage and allows the water flosser to be used safely for shower in the bathroom. 360 Rotatable Nozzle Design:The 360rotatable nozzle allows you to easily clean areas that are difficult to reach and prevents tooth decay, dental plaque, dental calculus, gingival bleeding and dental hypersensitivity. Three Mode & Auto-Timer Protect:Normal, Soft and Pulse Modes With Memory Function. Choose the Most Comfortable Mode That Suits Your Needs. Soft Mode Is Recommended for First-Time Using. AUTO-TIMER Protect: Stop Running Automatically After Two Minutes of Work. Portable & Long Battery Life:With the Portable Size and Lightweight, Its Brings Great Convenience to Your Travels. Adopt Latest Technology Lithium Battery of More Sufficient Power. Power-Saving Improve 10%.The Powerful Lithium Battery Is able to be Used Continuously for 20 Days Once Fully Charged in Just 4 hours.