Product Name:  Wireless Bone Conduction Headphones Bumblebee Item NO:  KB20070-1 Description:  1-Bone conduction technology and TRANSFORMERS classic concept; 2-Not plugging ears; health, safety and comfort; meet environmental standards; 3-5.0 Bluetooth version; HD Stereo Sound Quality; 4-Light and flexible Steel wire nickel-titanium memory alloy; 5-Waterproof; 6-hour playback time 6-Ergonomic design, secure wear; 7-Sunken design makes glasses compatible with headphones. Including:  1-Wireless bone conduction headphones*1 2-USB cable*1 3-Earplug*1 4-Portable storage bag*1 5-Instructions*1 Specification:  1-Speaker Type: Bone Conduction Speaker 2-Frequency Range: 20Hz- 20KHz 3-Wireless Range: 10meters (30 Feet) 4-Battery: Rechargeable Lithium Battery 5-Maximum Charge Voltage: 3.7V 6-Battery Capacity: 200mAh 7-Charging Time: 2 Hours 8-Playback Time: Up to 6 hours (depend on volume and sound source)

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