1. True Sound Restoration Hear sounds the way the brain intended. Uses a 16 channel smart digital chip, the latest in HD sound processing chips for lossless, clearer sound. That helps to provide better quality sounds and reduces whistling sounds coming from the hearing aids. 2. All day Convenience Can last up to 15 hours on a single charge. charging case as power bank provides up to 7 days power. Lithium ion technology allows for a quick charge when need be. Lithium ion batteries are recharged via electromagnetic induction. Simply drop the device into the charger and charging will automatically begin. 3. Nearly Invisible Design Our digital hearing aids are very small (0.4'x 0.5'x 0.8'), lightweight (just 2 grams), discreet and almost unnoticeable in your ear. They are small, lightweight, and nearly invisible. 4. Easy And Convenient To Use Each hearing aid has an on/off switch and an adjustable volume control knob. Comes with several different sized earbuds for a personalized fit. The earbuds are soft and very comfortable to wear.