Anker Select 2. RMS rated power: 8 W. Connectivity technology: Wireless, Bluetooth range: 20 m, USB connector type: USB Type-C. Product type: Stereo portable speaker, Product colour: Black, Volume control: Buttons. Recommended usage: Universal. Battery type: Built-in battery, Battery technology: Lithium-Ion (Li-Ion), Battery capacity: 5200 mAh