Powered by BACtrack's proprietary Advanced MicroCheck® Sensor technology, the ultra-compact BACtrack T40 personal breathalyzer quickly and easily estimates your alcohol level in seconds. It's sleek, discreet design make it perfect for BAC testing on the go - take it with you any time you drink! From happy hour to dinner parties, the tiny BACtrack T40 alcohol tester will raise your drinking IQ, helping you and your friends make better decisions while drinking.