FRIENDLY TO SENSITIVE GUM- F5029 water pressure range starts from 10 PSI and with a professional maximum 90 PSI. Sensitive gum, the olders, orthodontic users can find their comfortable flossing mode and water pressure in F5029. MOST POPULAR FLOSSING MODES - 4 flossing modes including Custom Mode. User can DIY their own custom mode, considering the variety of oral condition, POWER - Water flosser is powered by AC/DC power cord, and sonic tootbursh uses built-in rechargeable battery. REPLACEMENTS NOZZLES- There are 2 standard nozzles in the pakcage box. you can add more nozzles to make it more professional and attractive. We provide standard nozzles, orthodontic nozzles, periodontal nozzles, tongue scraper nozzles, and nasal nozzles for nose.