Thermos 24 Ounce Hydration Bottle with Connected Smart Lid, Smoke Measures the intake of liquids while providing real-time temperature readings. The Hydration Calculator calculates your suggested hydration goal based on your personal data. Chart and graph daily, weekly, and monthly hydration progress. Up to a 12 day battery life before needing to be re-charged. Requires iOS7+ and works with the following Apple Devices: iPhone (4S and later), iPad (3rd generation and later), iPad mini (all generations), iPod touch (5th generation and later) Apple, the Apple logo, iPhone, iPad, iPad mini, and iPod touch are trademarks of Apple Inc. . App Store is a service mark of Apple Inc. The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Thermos L.L.C. is under license. Other trademarks and trade names are those of their respective owners