Breathalyzer keychain, new in sealed package

BACTRACK BAC testing. convenient keychain breathalyzer in package w/ fold out mouthpiece. multiple users, 3 mouthpieces LED display, instruction manual. The battery that is included in the sealed package does not look usable. I can send a fresh battery. Manufactures statement: Quickly and easily estimate your BAC with the small and affordable BACtrack Keychain Breathalyzer. Powered by BACtrack's proprietary Advanced Microcheck Sensor technology, the BACtrack Keychain provides reliable and accurate BAC results you can trust. It's ultra-compact, portable keychain design makes it perfect for personal BAC testing on the go - simply blow into the fold-out mouthpiece and results are returned in seconds.