Feature:1.Aluminum alloy case, more textured, more matching with motorcycle2.Wireless Bluetooth connection playback, please bond the wire3.FM radio function, more information at your fingertips4.Waterproof design for all kinds weather5.An external USB flash drive can be used to charge the mobile phone6.Metal appearance, multi-function motorcycle audio, dual-channel wireless Bluetooth FM waterproof audio 3 inch full-range speaker 40W high powerSpecification:Name: motorcycle Bluetooth speakerModel: MT473Shell material: aluminum alloyWorking voltage: 12VFrequency response range: 87HZ-20KHZSignal to noise io: ≤37dBSpeaker size: 3 inchesMaximum output power: 20W*2Function: Bluetooth playing, FM radio U disk playing, Speaker flashing light, 1A mobile phone charging interface, IP56 waterproof.Features: Voltage overload ion, Reverse ion, Built-in amplifier, Supports lossless format audio such as WMA/WAVPackaging cartonsGross weight: about 880gColor: SilverPackage List:Speaker*2Mounting clip*2Connection wire set *1Manual*1