The SoundCore A25i are true wireless headphones in black that will surprise you with their capabilities and perfect sound. When fully charged, the headphones, along with the charging case, offer up to 28 hours of music enjoyment, no matter where you are. Two built-in microphones allow you to make uninterrupted voice calls. Listen to music for as long as you want. With long-lasting batteries, the SoundCore A25i headphones can operate for up to 9 hours on a single charge. Additionally, the included charging case extends this time to about 28 hours. When the charging case runs out of power, you can simply use the included USB-C cable to easily recharge the headphones.