1. The adjustable metal head beam uses invisible steel to run through the whole . The of the head beam can be adjusted in ltiple accoing to the head she, and the eansion and contraction are nural< />2. tooth 5.3 sng core, stable and no delay, longer transmission distan, higher sound quty resolution, snger sound field dynamics< />3. Non-destructive noise reduction, stereo subwoofer , dynamic ser, with internional tuning maste to re the high, medium and low three frequencies, and restore the sound laye in a nd manner< />4. lti-mode playba tooth / plug-in ca / plug-in line por mobile / table equipped with tooth devi elecnic produc, divee chois are not limited< />5. Compible with devis without restriction, compible with Android, , , system mobile , etc.< />< />Product Description:< />1. tooth veion: 5.3< />Transmission distan: 10 Use time: 10 hou< />Standby time: auicy shut down after 5-8 mies< />Btery: 450mAh rechargeable lithium btery< />Functions: Adjust volume, switch , answer , r , , tooth playba, one , tooth recontion, voi promp, display, FM, TF, EQ,< />e English oadcast, one for two< />Color: own< />: plastic< />< />Paage Conten:< />1 x headone< />1 x usb cable< />1 x o cable< />1 x nese and English instruction manual< />< />Only the above paage content, other produc are not included.< />Note: Light reflion and different displays may cause the color of the item in the picture a lite different from the real thing. The measurement owed error is +/- 1-3cm.