From HearingAssist, America's #1 Affordable Hearing Brand! The HearingAssist STREAM Behind the Ear (BTE) provides all the latest in technology at an incredible price! Amplification, full app control and Bluetooth streaming on both apple & android devices (calls, audio streaming, etc). Uses our HearingAssist app which gives you greater control over your sound environment. Charging case itself contains rechargeable battery so units can be charged on the go. Background noise cancellation, feedback suppression. 4 programs (Normal, restaurant, traffic, outdoor). Battery lasts 16 hours in full hearing mode and 4 in constant streaming mode. Case battery provides 3 charges prior to needing to plug in. Charge time about 2 hours empty to full. When charging your hearing aids we highly reccomend you first remove the hearing aids fromt he case. Then charge the case entirely with the USB cord plugged in. Lastly, unplug the USB cord from the case, and charge the hearing aids - this will ensure your heairng aids recieve a full charge.