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Color:Grey What is a bone conduction? Bone conduction is a way of sound conduction which transfer sound waves through Cranium,bony labyninth,inner ear lymph fluid,auditory nerve,auditory center. We can hear the sound using bond conduction every day. Note:There may be an external sound,please pay attention to the protection of personal privacy. From a professional point of view, it is not a leak, it is the second sound, So we developed the fourth generation of technology, our new technology reduced the sound leakage of 87%. Bone conduction headphones sunglasses feartures: Security Health Comfort Bone Conduction Earphones Specification Model: Alien 5 Weightï¼32g Sizeï¼6.1*5.7*1.9 Inch Bluetooth: Bluetooth 4.1,Support A2DP,APTX Bluetooth Chip: CSR Bluetooth 4.1 Bluetooth Distance: 10m Battery: 250mAh Charge Time: 2Hour Charge Voltage: AC 110V/220V,50/60Hz, DC 5V, Max 1A Charge Port: Micro-USB Waterproof: IP67 Standby Time: 10 Days Music Play Time: 3-4Hours Conversation Time: 4-5Hours Note:There may be an external sound,please pay attention to the protection of personal privacy. Attention:Please avoid using it when bathing, swimming, or in the rain. Do not attempt to disassemble or change any part of the product. Package Content: 1x Bone conduction glass 1x USB cable for charging 2x Transparent resin lens Model 1x English User Manual 1x Anti skid raised nose pad