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Feature: 1. Unique round Design,Support multiple perspectives. 2. Small and lightweight--can use the lanyard or key chain hang on your bag,bike or put into pocket for on the go use,just set your hands free, making your travels more convenient. 3.Experience your tunes in high definition,built-in bass engineered to produce big bass and powerful sound can fill any room with rich audio and clear and crisp music. 4.Built-in rechargeable battery --Recharge from your laptop, desktop or powered USB hub 5.Broad Compatibility: Connect with any Bluetooth-enabled device (Bluetooth 2.1 and over) Specifications: Model:BOOMER VIVI B05 Bluetooth Version: V3.0+EDR Interface Type:USB Loudspeaker Output:3W Playback Function:MP3 Material:Luxury Metalwork HD Microphone:Built-in Compatibility:Bluetooth Connection:All Bluetooth Enabled device; Multifunction button:for power on/off and answer/reject/end calls; Color:black Product size:80*32*32mm/3.1*1.2*1.2in Charging time:About 2.5 hours Battery capacity:400mAh Speaker Size:1.5 inch Sensitivity:100db Degree of distortion:1% Weight:135g Operating Distance:10 meters( Barrier free) Work voltage:3.7V-4.2V Package Detail: 1* Bluetooth speaker 1* USB power cable 1* Manual 1* BOOMER VIVI 12-Month Warranty