Specification: Product name: LF-18 Bone Conduction Bluetooth Earphone Bluetooth: V4.1 Compatibility: Universal Net weight: 60g Cross weight: 290g Interface: V8 Charging mode: Adapter output(DC5V 150mA) Support agreement: Head set\/ handsfree\/ A2DP\/ AVRCP Talking time: 8 hours Standby time: 10 days Battery capacity: 260mAh Tech: CVC noise reduction NFC Tech: Fast Match The Smart Phones With NFC Chips One-to-two Tech: Play music from both devices simultaneously Description: Bone conduction sends sounds through the cheekbones instead of air, providing you the uninhibited situational awareness. Ear opening help you keep the attention of surrounding while being used, which makes it a good friend for sports enthusiast. What's more, it's sweatproof. It can also help people with hearing impairment to hear again. And it works for elder, too. MirageBlack gives you a strong visual impact. Human nature designed buttons, just free your hands. No more complex operations. Multi-functional dialing key, press once to answer the phone call, press twice to repeat the last call. CVC noise reduction provides you clear calls. You can use NFC function to match it to NFC mobile phones easily. IF-18 can connect to two devices at the same time. Package included: 1 X IF-18 Bone Conduction Earphone 1 X Charging Cable 1 X Noise Protecting Ear Plug 1 X Elastic 1 X Manual