Red Calls/Music In-ear Headset. True Wireless Stereo (TWS) Bluetooth. Intraaural Earbuds. Microphone type: Built-in. Built-in battery Lithium-Ion (Li-Ion). Beats Studio Buds. Experience immersive listening wherever you go with Beats Studio Buds—true wireless noise cancelling earphones. Control the noise. Dynamically block unwanted external noise with Active Noise Cancelling (ANC). When you need to hear the world around you, switch to Transparency mode, which uses external-facing microphones to mix the sounds around you for a natural listening experience. Driven by premium sound. Beats Studio Buds are engineered to deliver powerful, balanced sound in a compact design, through an entirely customized acoustic platform. The result — immersive sound that pulls the emotion of music from the studio to your ears to keep you going all day long. Up to 8 hours of listening time. These earbuds have up to 8 hours of listening time1 with two additional charges provided by a pocket-sized charging case2, giving you up to 24 hours of combined playback. If you need a little extra juice, 5-minute Fast Fuel charging gives up to 1 hour of playback3 when the battery is low.