Pyle PWPBT60 Sound Box Splash Marine Grade Portable Wireless Speaker - BlackMarine-Grade IP-X4 splash proof & shock resistant designWorks with virtually any Bluetooth enabled device(Smartphone, Tablet, PC, MP3 player, etc.)Built-in rechargeable batteryEasy-push button controlsImpressive bass outputBattery: Lithium 1400mAIncludes USB charging cableBattery Life Average: 6 HoursMetal hook loop for easy attachment to karabiner, chain, or wireDedicated full-ranged stereo speakersEffectively recreates Lows, Mids and HighsFrequency Response: 60 - 20,000HzImpedance: 4 OhmDimensions (W x L x H): 2.5'' x 8.3'' x 2.7''Sold as: UnitWeight: 1.82 lbs.