... , MP3, MP4 and CD player2. FM radio: The headset can be used as FM radio separately, search and lock ... distance > 30 meters(360 degree)5. Signal-to-Noise Radio> 50db6. Distortion < 2% THD7. Speaker : 40mm mylar8 ... company can provide other style bluetooth headphone headset, in-ear style, ear-hook style, headbrand style ... hours, thank you! KST-984 4 in 1 cheap Wireless Headphone/ wireless headset