The BLACK DECKER BDBTS20B 20V Bluetooth Speaker is a 4 speaker that delivers loud, clean, crisp high performance sound. It has an built in auxiliary cable, a durable rubber handle for easy portability, and also offers a control volume from built-in buttons or with mobile device. This speaker has two ways to power: 20V MAX battery (not included) or an AC wall power cord (included). This speaker is compatible with all Bluetooth enabled phones, tablets or devices. It is perfect for both indoor or outdoor use. A Part of the Black Decker 20V MAX battery system. Includes: BDBTS20 Wireless Speaker, AC wall power adapter, User instruction manual. 20V MAX battery and charger sold separately.