The Beats by Dr. Dre Powerbeats Pro Wireless Earbud Replacement in black is a single left earpiece designed for use with the Beats by Dr. Dre Powerbeats Pro model. This replacement earbud features a comfortable ear-hook design and wireless Bluetooth technology for convenience. It also includes a built-in microphone and offers connectivity options such as Bluetooth, USB, and Lightning. The package includes one left replacement earbud, making it a suitable choice for those in need of a replacement for their existing earbud.