Portable Premium Stereo Bluetooth Speakers, 20W Output 3D Surround Speakers, Bulit-in 4400mAh Power bank and Microphone  

Specification:

Bluetooth Version: 2.1+EDR
Unit Size: 171*52*61mm
Net Weight: 426g
Output power: 10w+10w
Bluetooth transmission distance>10M
Distortion: <10%
SNR: >75db
Frequency scope: 70Hz-20KHz
Power supply mode: Built-in battery 4400mAh 3.7V
Audio input: Bluetooth,TF Card, AUX
Charging interface: USB MICRO-5P Socket

Product features:

standard Support
Bluetooth stereo sound,
perfect sound qualityoutstanding bass effectAudio transmission distance is 10MSupport iPhone,iPad and alltelephones which have Bluetooth function. 
With Bluetooth hands free function,Buil-in high fidelity chip,can answer callsWith Bluetooth music controlling function
Buil-in lithium battery
Aluminum alloy material design,portable and fashionable
Can read TF card and U-DISK directly in MP3 files.
Mobile power supply function