Come and see our amazing products. This personal sound amplifier is built with a digital chip and frequency control to adapt easily to different sound environments. This also features a premium German battery with the longest life available in the hearing amplification industry.Using polymer lithium battery, the battery life lasting 500-800 hours,It can be used for about 20 hours after charging.Small, behind the ear amplifier designed to be practically invisible and very light weight. A rotatable ear piece allows this digital hearing amplifier to be worn in either ear seamlessly. This is a great solution for any that are hard of hearing. Pls confirm further with us if any query about packing info, inventory status and time schedule.