Bluetooth Sports Audio Speaker, Wireless Portable Audio Super Portable Speaker,with Pocket Size for Outdoor Sports & Audio Built-in Microphone for Calls for Cellphone

Features: 
Bluetooth 4.0: seamless stable wireless connection with high Transmission speed
Button control: simple button make you control easier playback, previous, next and power on/off
Mini size, powerful function : TF music playback, bluetooth music playback, bluetooth phone, radio, and inserts earphone 
Wide Application: connect cellphone and all tablets, notebook computers, desktop computers which there is bluetooth adapter built-in
Audio Source: Bluetooth Enabled Devices & Line in & TF card

Specification
Material: silicone 
Battery Capacity: 400mAh 
Play time: 4 hours 
Weight: 40g 
Supported formats?MP3, WMA, WAV 
Charging time: 1-2 hours