The Care Kit provides you with everything you need to maintain your Lexie B1 Powered by Bose self-fitting OTC hearing aids in order for them to perform optimally. The Care Kit will last up to 6 months for a duo set of hearing aids. The Care Kit contains: 12 x battery packets, 4 x cleaning brush, 12 x open domes in different sizes, 12 x closed domes in different sizes, 1 x wax guard packs, and 1 x drying capsule packs.