Feature :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: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 MiniFor iPhone4/4s/5 For Samsung / Xiaomi /HTC All bluetooth smartphone ...Package Includes:1x Bluetooth Speaker1x Audio and USB charging cable1x Retail box