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Quickly test your BAC levels with this BACtrack BT-M5 mobile breathalyzer which is compatible with most Bluetooth-enabled iPhone and Android 4.3 or later smartphones and features police-grade Xtend sensor technology to ensure accurate readings. Compatible with most Bluetooth-enabled iPhone and Android smartphones Including iPhone 4S 5 5c 5s 6 and 6 Plus and most Android 4.3 or later models. Police-grade Xtend fuel-cell sensor technology Offers accurate consistent results. ZeroLine technology Gives you an estimate of when your BAC will return to 0.00% helping to keep you apprised and make safe choices. BACtrack companion app download required Saves and tracks your BAC levels over time. You can also include optional photos notes and drink logs to keep a thorough account. Apple the Apple logo and iTunes are trademarks of Apple Computer Inc. registered in the U.S. and other countries. iPod is a trademark of Apple Computer Inc.