The LARQ Self-Cleaning Water Bottle Granite White 500ml cleans itself, has its own water purification system, and a double wall. The bottle purifies the water within 60 seconds with UV-C LED light. This light removes 99.9% of harmful bacteria and viruses from the water and the bottle. The UV-C LED technology is activated every 2 hours or at the push of a button. You can also easily store a hot drink in the bottle. That's because the bottle has a double wall that keeps your drink warm for 12 hours. Cold drinks even stay cold for up to 24 hours. This water bottle is a lot more hygienic, and you also use less plastic. The water purification system works for one month on a full battery. After that, you can easily recharge it with the included cable.