Product Name: Bluetooth Wireless Bone Conduction Headphone Sport Stereo Headset with Flexible Size Design Model NO.: BCH-268 prov Distance version: Class A Color: Black Characteristics: Bone Conduction Function: Bluetooth, USB Soundtrack: Dual Track Bluetooth Version: 4.2 Usage: Mobile Phone, Call Center, MP3 & MP4, Computer, Game Player Style: Neckband Feature: Flexible Technology: Bone Conduction Sweatproof: Yes Open Ear Design: Yes Trademark: OEM/ODM Transport Package: 20PCS/CTN, 34 X 33 X 30cm Specification: Plastic+ silicone Origin: Shenzhen Product Description This Smart Bone Conduction Headset is abluetooth V4.2 version offering fast and very stable connectivity. The new technology allows this headset to transmit sound waves from the upper cheek bone to the ears, rather than conventional "old style" in ear phones.Designed for outdoor enthusiasts and sports people, they aresweatproof, moisture & drip resistant.Great innovation and smart technology to deliver the most incredible sound to enjoy all types of music.Specifications:Product Dimensions:137.3*123.66*49 MMWeight: 39gBlue tooth Version: V4.2Telegram phone number (the headphone will voice broadcast the caller ID)2 in 1 Function:It may connect two devices with bluetooth at the same timeBattery: 200 mAh Polymer battery Play time: 6hoursStandby time: 10daysEffective range: 10m (33feets)Mono/Stereo: StereoBluetooth Class: Class1, Class2, and Class 3 PAReceiving Sensitivity: 88dBmImpedance: 32dbFrequency range:20-20KHzMic: Anti-interference microphones, -50DBCharging: MicroUSB port and need 2hColor: Black, Blue,RedWhats in the box !1 X Bone conduction headphone1 X USB Charging Cable1 X ManualCompany PicturesCertificates