Universal Bluetooth Wireless Sweatproof Sports Magnetic Earphones with TF SD Card Slot 
Support TF card 
With TF slot, you can save your phone memory card size by saving your music to it instead your phone or you can even leave your phone at home and enjoy your freedom exercising. 
(TF SD card is not included) 
Comfortable and Secure FIT for sports 
Ergonomically design ensure your headphones stay comfortable firm in the ears; 
Built-in Magnets 
Magnetic attraction feature let you attached the two headphones to your neck when not using, then avoid losing them. 
Bluetooth 4.2 latest technology 
Stereo sound, good bass, crystal clear and stable; With built-in Mic for handsfree phone calls 
High Compatibility 
Compatible with all smartphones, tablets, music players. Easy and fast pairing with bluetooth enbled devices 
Product specification: 
Bluetooth version: V4.2 
Transmit Range :10 meters 
Standby time: 100 hours 
Charging time:1-2.5 hours 
Capacity Battery: 80mAh Built-in rechargable Battery 
Play time:3-5 hours 
Light Weight:only 30g 
Battery: Rechargeable polymer lithium-on battery 
Built-in microphone 
Function:Play/Pause,Volume Control,Song switch,Voice prompt, 
Package include: 
1* bluetooth headphones 
1* usb cable