AG portable oral irrigator usb rechargeable water flosser Dental Water Jet 300ML Water Tank Waterproof Teeth Cleaner When using electrical products, especially when children are present, you should always follow basic safety precautions. Please check the instructions first. Charging Unit Prior to First Use This product does not come with an AC/DC charger. The unit is charge through devices with 5V USB's power capabilities such as mobile phone, lap top, USB power wall charger, etc .The charge indicator on the handle will flash when charging and will stay on continuously when the unit is fully charged, A complete recharge will take 3-5 hours.