Big sound, built for adventure. The Anker Soundcore Boom 2 delivers up to 80W of booming bass with BassUp(TM) 2.0 and crisp 2.1 stereo sound. Play all day with 24-hour battery life and a built-in power bank to charge your phone. Waterproof, floatable, and PartyCast(TM) 2.0 enabled to link 100+ speakers-perfect for epic outdoor fun. Complies with CPSIA, Prop 65. 3.98" W x 7.28" H x 11.65" L