【Your Oral Care Expert】mornwell introduces the latest powerful whitening floss. Strong power upgrade version, using independent voltage stabilization system to emit high-frequency pulse water flow (up to 2200-3000 times per minute), 360° clean mouth without dead ends 【300ml Large Water Tank】This portable dental flosser with 300ml large reservoir can offer 75s uninterrupted water flows for you, enough for cleaning your oral at one time. IPX7 Waterproof design allows the dental flosser to be used in the shower. 【Friendly function】F29 breaks the design concept of the traditional Water Flosser and introduces two innovative functions-3-second crescendo and memory mode. This is the ideal design for first-time users or those with sensitive gums. The 3-second pulse crescendo function allows your gums to adapt more easily and avoids damage to the gums by excessive water flow. 【USB Rechargeable Water Flosser】Its built-in 1400mAh lithium battery can last up to 40 days once fully charged(only 4 hours). Safe and easy, compatible with any power source with a USB port, This is an excellent travel water flosser 【Product List 】Cordless water flosser handle *1, nozzle *3, USB charging cable *1, user manuals *1. Mornwell electric water flossers always provide 30 days money back and 12 months warranty , if you have any questions, please feel free to contact us and we will get back to you within 24 hours