Xtend Fuel Cell Sensor Technology - BACtrack's police-grade sensor technology is the same technology trusted by hospitals, clinics, and law enforcement, and offers the highest level of accuracy and consistency</br>Bluetooth Connectivity - Wirelessly connects to your iOS or Android device via Bluetooth</br>BACtrack Companion App - The free BACtrack app saves and tracks BAC results over time, including optional photos, notes and drink logs. Proprietary ZeroLine technology gives you an estimate of when your BAC will return to 0.00%</br>Compatible Devices - Apple iPhone 4S, 5, 5C, 5S, 6, 6+; iPad 3, 4, Mini, Air; iPod Touch 5, 6; Samsung Galaxy S3, S4, S5, S6; HTC One; Sony Xperia Z2, Z3; Google Nexus 5, 6; LG G3, G Flex; Moto X, G and most other popular Android smart devices running Android 4.3 or higher</br>Manufactured by BACtrack - The #1 most-trusted brand of breathalyzers, with over 14 years of experience providing the most accurate, convenient and affordable breath alcohol testing devices on the market</br></br>Product Description</br></br>Instantly transform your smartphone into a police-grade breathalyzer with the award-winning BACtrack Mobile. Quickly and easily estimate your blood alcohol content (BAC), track your BAC results over time, and with ZeroLine, estimate when your BAC will return to 0.00%. Features wireless connectivity via Bluetooth, powerful app-enabled BAC tracking tools and is compatible with most iPhone and Android devices. Because of its police-grade fuel cell sensor technology, BACtrack Mobile is ideal for both personal and professional use.</br><br/>http://www.amazon.com/gp/product/B00CFN1HNY