Are you looking for a wireless earbud-type headset that delivers an impressive playback time? If your answer is yes;bring home the boAt Airdopes 138 that comes with a carrying case. This carrying case also acts as a 650 mAh portable charger that extends the playback time of these earbuds by up to 15 hours;i.e. 4 times its normal charging capacity. The normal battery capacity of each of these earbuds is 40 mAh and this delivers up to 3 hours of playback time. These earbuds feature Bluetooth v5.0 technology that delivers a stable connection that lets your rock on without connectivity issues. The stereo calling feature of these earbuds allows you to enjoy calls via its built-in microphone and 13-mm drivers. These earbuds are powered up by the IWP Technology featured in them the moment you open the case. The presence of a Type-C charging port ensures you can easily charge it with any charger that has a compatible cable.