Portable Mini Bluetooth Speakers Metal Steel Wireless Smart Hands Free Speaker With FM Radio Support SD Card For IPhone S28Features:S28 Wireless Bluetooth Speaker Support Answer Calling and TF CardSupport TF card(micro SD TF card)with TF card slot、can play MP3 format files in the TF cardSupport Mobile Phone/Laptop/Tablet PCExpanded Bass Xpansion system drives a fuller richer low-end responseLarger 45mm driver delivers precise highs for superb soundBuilt in rechargeable battery、charged by computer via USB interface.Specifications:Size: 58*50mmMaterial: Aluminum alloy + plating + Bluetooth electronic moduleProduct function: Bluetooth connectivity、 computer add-in、 card speaker、 speakerphone、 radio、 charging、 switch songs.Support A2DP、 AvRCP、 headset、 hands free profileWorking range: up to 10mWorking time: 2-4 hoursHorn specifications: 45mm 26Ohm 3WLoudspeaker Output: 3WFrequency response: 280Hz-16KHzSignal to noise: 95dBDistortion: 0.5%Battery Charging Voltage: 5VBattery Charger Time: 2 hourCompatible with :For iPad / For iPad2 /For New iPad /For iPad Mini、For iPhone For Samsung / Xiaomi /HTC All bluetooth smartphone ...How to use: 1.Turn on the power switch (At the bottom)2.Then turn on the Bluetooth function of your smartphone and search devices3.Connect with this deviceFM Radio operation1:Connect the cable to USB 5pin (it is antenna).2:Turn on the switch to MP3. (there have 2 model ) Bluetooth and MP3 .Please long press play button 3 second to switch to Radio model. and press play button 1 second 、then will Automatic search .Note:The sound can be turned up/down by press music next/pre button for about 10 seconds.Package Includes:1x Bluetooth Speaker1x Audio and USB charging cable1x munual