AlcoMate Prestige Breathalyzer Pack Option * FULL PACK (2 x Batteries, 5 x Mouthpieces, Carry Pouch, HARD CASE) BASIC PACK (2 x Batteries, 5 x Mouthpieces, Carry Pouch) *Full packs include an exterior hard case, basic packs do not; otherwise all other accessories are identical between packs. **Sensor modules for Prestige are RED for devices purchased after 2008; the GREEN module for Prestige is for legacy Prestige devices purchased 2008 or prior (the RED and GREEN modules are incompatible with each other). Simply look into the exit air vent of their device (directly opposite where the mouthpiece is inserted) to examine the corners of the interior circuit board of the module. RED/GREEN for sensor modules has nothing to do with the exterior color of the device. The AlcoMate Prestige is the original breath tester that introduced pre-calibrated replaceable sensor module technology to the market. Pre-calibrated replaceable sensor modules eliminate the need for traditional mail-back calibration service that is required of all other typical breathalyzers. The AlcoMate Prestige breathalyzer is the original device in our product line that showcases patent-pending pre-calibrated replaceable sensor module technology. The AlcoMate�® Prestige breathalyzer is DOT Approved for law-enforcement grade accuracy and US Coast Guard Approved to satisfy the requirements of all marine vessels in US waters to have a breathalyzer-on-board. The Problem with Re-Calibration One of the most important things to understand when using a breath alcohol tester is that all typical breath alcohol sensors require periodic re-calibration in order to maintain accuracy. It is inherent to alcohol sensing technology, much like gasoline engines in cars require oil changes in order to function properly. Most breathalyzers have to be physically mailed to a service center along with a fee to get this re-calibration done, and you will be without your breath alcohol tester until the service is done. Even if re-calibration is done on schedule, the service does not restore any wear on the alcohol sensor, and eventually your breathalyzer will fail completely due to the sensor breaking down. The Solution: Pre-Calibrated Replaceable Sensor Modules! The AlcoMate Prestige eliminates the problems of re-calibration by eliminating the need for re-calibration completely! No more downtime, no more back-and-forth mailing, no more gradual sensor breakdown, because you replace each sensor module with a new pre-calibrated one each time! Because the sensor modules are pre-calibrated, there is nothing you have to do but simply swap out the old one with the new one.