Battery Base in Black, for Echo (4th Generation).

Sold by Dreamware Microsystems · Odorkor

Make your Echo portable with the Mission Battery Base. Certified “Made for Amazon” accessory specially designed to work with Echo (4th Gen). Echo sold separately. Enjoy your music away from the power outlet with integrated battery lasting up to 5 hours. Seamlessly attaches to the to the base of Echo (4th Gen) without tools.