Sunnice&reg; New Wireless Sport Head Loop Stereo Water Resistant Earphone Headphones Handsfree Music Earbud Headset Neckband Headphone Music Mp3 Player TF Card SD Card Slot Fm Radio Headset (White and Green) Portable,lightweight,sporty exterior design,you can listen freely when you are sporting,leisure,working Just save your loved songs in TF card and then play them with this sport player.(TF card NOT included) Comfortable and secure for most users: bicyclist, runners, joggers, walkers, etc. Stylish and cool wireless neckband, sporty appearance, so that you enjoy joy and comfort of music in sports. "High-quality speakers and sound chamber designed to ensure high-fidelity,sound effects Continuously adjustable volume,play free transform state."