In-ear Earphones - Universal - Bone Conduction Bluetooth 4.0 Stereo Headset Stereo Headset Headset Highlights Universal Bone Conduction Bluetooth 4.0 Stereo Headset Stereo Headset Bone Conduction Bluetooth 4.0 Stereo Headset Stereo Headset The product is shipped according to the color or size of the main product page image. Features: 100% brand new and high quality use the bone conductive speaker so that the sound can pass the skull directly to the auditory center, eliminating many stages of acoustic transmission. Free ear licate tone function. Stylish, ergonomic/unique design, will provide better experience for listening than normal bluetooth headphone shape design, easier to fit your head. :Accessories and Parts,Earphones and Headphones:Ear Length:Non-Communication:WirelessWireless Type:BluetoothPlug Type:WirelessConnectors:USB,Other Function:Bluetooth,Wireless Headphone,SportVocalism Principle Range:100Hz-18khzTransmission Range:10 sensitivity meters on the contrary Ackspecifications: Bluetooth Version: 4.0color: BlackFrequency Range: 100Hz-18Khztransmission Range: 10 meters Sensitivity: 1003DBMICROPHONE Sensitivity: -503dbplayback Time: up to 5 hours