Product information and features: The Prime Alcoscan AL2500 is a reliable, easy to use compact breathalyzer with simple one-button operation and large back lit display allows discreet use even in the dark. An additional acoustic warning helps in the reading of results. Ultra-compact dimensions – fits in any shirt pocket No mouthpiece required Convenient one-button operation Easy to read digital display with back light Acoustic warning signal (three in conjunction with the display) Reliable measurements Energy-efficient Battery charge indicator Responsive operation with visible countdown to production of results Quick and easy to use Ranges from 0.00 to 4.00 per thousand, 0:00 to 0:40% BAC, 0:00 to 2:00 mg / l BrAC Semiconductor sensor Material: Plastic Automatic shutdown 4 x 10.4 x 2 cm Weight: 85 g including batteries 1 x device 1 x set of AA batteries