Spacious 360° sound the boom 2 is the perfection of the legendary cylindrical design, custom engineered by us for room-filling stereo quality sound output that radiates evenly in all directions.hammer acculability the boom 2 uses the same battery technology as some of the best electric cars. it can play music for 15 hours* on a single charge without going flat.the boom 2 is fully designed to get wet once in a while. ipx7 protection rating guaranteed.adjustable eq settings select the best sound settings for different occasions using 4 different presets and a customizable tuner.audio maximum sound pressure level 90 dba.frequency range 90 hz 20 khz. speaker two 2-inch coils and two passive 2-inch-by-4-inch coils.wireless functions pair up to 8 bluetooth-enabled source devices connect up to two source devices simultaneously. the mobile playback range is up to 30 m. compatibilityfor audio playback smartphones, tablets and other devices that support the bluetooth and bluetooth smart® wireless audio profile.