This alcohol tester can accurately analyse blood alcohol concentration(BAC) levels.Testing by user's exhalation.Features:Threaded by keychain in order to be more convenient carryingQuick response and resume capacityFlashlight torch function(Orange light)Colored LED display alcohol levelFunctions:Alcohol testLong press and keep holding the "POWER" button untill the green LED lighting on.It means the tester is ready to test，then exhale pneuma into exhale pipe and look into the result as follows:IF Green LED keeps lighting: Safety-under 0.02% BAC(Blood Alcohol Concentration) or 0.1mg/L BRACIF Yellow LED keeps lighting: Caution-under 0.02%-0.05% BAC(Blood Alcohol Concentration) or 0.1mg/L-0.25mg/L BRACIF Red LED keeps lighting: Danger-over 0.05% BAC(Blood Alcohol Concentration) or 0.25mg/L BRACNotice: Please make sure to keep holding the "POWER" button during testTorch function:Slide the "ON/OFF" foward， then the LED lighting up with orange lightPower supply: 2pcs 1.5V AAA battery(NOT included)Dimension: 70*40*18mmColor: blackUnit packing gross weight: 24gPackage included:1 x Alcohol tester1 x User manual