Description:Name: Bone Conduction HeadphonesBattery: 380MAH;Usage time: about 10 hours;Bluetooth-compatible&nbsp;version: version 5.3;Bluetooth-compatible&nbsp;chip: Jerry chip;Frequency: 20Hz-20KHz;Impedance: 32 euros;Sensitivity 85dB/mW;Waterproof rating IPX 5;Speaker type: bone-conducted shaker speaker;Bluetooth-compatible&nbsp;distance: about 10 meters;Charging time: about 2.5 hours;Bluetooth-compatible&nbsp;protocol: A20P/AVRCP/HSP/HFP;Packing box size: 14.5x12.6x4.3CM;Complete weight: 86G;Headset weight: 31.6G;Packing list:1 x headset1 x USB cable1 x instruction manual1 x packing boxNote:There may be color difference due to different computers or smartphones, please forgive me! <div class="panel panel-info"><div class="panel-heading" style="font-weight:bold;">IMPORT: THIS ITEM IS SHIPPED FROM CHINA. PLEASE EXPECT UP TO 25 DAYS FOR DELIVERY</div></div>

M2 Bone Conduction Headphones Sports Wireless Earphones With Built-in Mic For Running Cycling Hiking Driving dark blue