Microbionic® amplifies sound up to 45 decibels so you'll never miss another word! Enjoy crystal clear sound reception with minimal background noise. Lightweight, comfortable device fits either ear. Rechargeable - no need for expensive batteries. Easy-to-use volume control. FDA cleared. Single kit (FH4452) includes 1 sound amplifier, 3 ear buds. Dual kit (FH6042 - sold separately) includes 2 sound amplifiers, 6 ear buds. Both kits include one AC adapter, cleaning brush and storage case.