From the product description, check product page for current description, price and availability:

• Advanced MicroCheck Sensor Technology – BACtrack’s proprietary sensor technology delivers reliable, accurate BAC results you can trust.
• Ultra-Compact Design – Fits inside a purse or pocket and can be easily used as a keychain. Warm-up time is 11-13 seconds. Battery life is approximately 150 tests
• Effective Breath Capture – The innovative fold-out mouthpiece ensures only your breath goes into the breathalyzer, while ambient air, fumes, and other airborne gases are kept out.
• One Touch Operation – Simply power on your BACtrack Keychain and BAC results are displayed on a bright, easy-to-read LCD display in seconds
• 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