Features:-It uses advanced digital signal processing technology to provide high-quality natural sound, detect and identify sound waves and change the amplification rate of the channel where the noise is located to make the sound clearer.-With volume control, it allows users to comfortably adjust the volume and tone for optimal hearing.-With a small and lightweight body (in-ear ITE design), it is very comfortable to wear on the left/right ear.-Built-in rechargeable battery, charges in 2.5 hours and can be used for 40 hours without replacing the battery.-Equipped with a portable plastic storage box (not a charging box), which is easy to carry and use anytime, anywhere.Specification:Peak OSPL 90 (dB SPL): 115dB+4dBHAF OSPL 90 (dB SPL): 110dB±5dBPeak gain.