describe:This product is very suitable for the elderly with heavy hearing. It has high-definition sound quality, the sound is not harsh, and the external microphone can reduce howling feedback.Filtered noise, wind and human voices can be heard clearlyProduct color: skin color, black, blueShell technology: ABSPower supply: rechargeableRated voltage: 3.7VWhether there is a built-in battery: YesBattery life: more than 12 hoursHearing aid category: behind-the-earPackage contains:1*earphone1*Charging cable