?Unique and Practical Button Design?To avoid mistakenly touching or pressing when being put in your bag or backpack during travelling, the power button is designed to be pressed more than 0.5 seconds to activate. During using, you can switch mode among Soft/Noraml/Pluse without power off the oral irrigator. ?Maximum Battery Capacity?Coofloss water flosser can be used 35-40 days after 4 hours of charging, twice battery life of others. ?Large Reservoir?300ml water tank is enough for a single-time use. ?4 Flossing Modes?The water flosser feathers 4 clean modes: normal, soft, pulse, and DIY. DIY mode and its memory function allows you to choose your preferred water pressure. ?Magnetic Charging?Magnetic charging is faster and more durable compared with traditional charging. ?First IPX8 Waterproof?Moving the charging port from the side of the body to the top makes this oral irrigator more waterproof. IPX8 waterproof prevents the interior circuit from being damaged by water. The reason why IPX7 water flosser often cannot be charged after several month’s use is because of damaged interior circuit. 1. Coofloss found that around 2% of first 5000PCS water flosser's nozzles has glue. The glue may cause the nozzle being not stable or even pop out. We will send 8 new nozzles if that happens. 2. Please remove the nozzle and water tank before first use. Then immerse the oral irrigator under water and press power button for 1 second. Wait 10-20 seconds. This can solve the issue of no water coming out.