The Philips AVENT Digital Steam Sterilizer works quickly and continuously, keeping contents sterile until you need them, giving you more time to get on with your day. Ready when you are Keeps contents sterile day and night This advanced sterilizer makes sure you always have a sterile bottle at hand by keeping contents sterile for 24 hours. It will automatically re-sterilize the contents every 6 hours. With the handy pause button you can also add or remove items at any time and the Digital Sterilizer will automatically re-sterilize the contents. Keeps you informed Advanced digital display and sound alerts The display and sound alerts tell you when sterilization is complete and how long items will remain sterile. The display also lets you know when you have filled the sterilizer with too little or too much water, so you can always be sure that sterilizing has been completed accurately and reliably.