vocalskull alien bone conduction glasses polarized sunglasses wireless bluetooth headset sports stereo music headphones with microphone for ios android windows bright black frame (green lens) vocalskull <p><b>feartures:</p></b> <p><b>1. security</p></b> <p>a. ear can easily listen to music when you hear the sound of traffic around, guarantee travel safety;</b> <p>b. hands free. bluetooth links, easy to operate, can receive wireless calls on the glasses.</b> <p><b>2. health</p></b> <p>a sound passed through directly to the auditory nerve bones, will not cause damage to the ear canal and eardrum, to maximize the protection of hearing;</b> <p>b so that the ear canal is more refreshing, not easy to breed bacteria, does not cause itching ears or ear disease;</b> <p>c.according to their own needs optional lenses in various environments are guaranteed to get the best vision protection</b> <p>d.our default comes with normal lens,you can buy the suitable myopic lens to exchange</b> <p><b>3. comfort</p></b> <p>ergonomic design, comfortable and secure</b> <p><b>description</p></b> <p>lenses colorl:bright black</b> <p>frame material:abs+pc+silica gel</b> <p>speaker type:bone conduction speakers </b> <p>attribute:polarized</b> <p>microphone:-40db ± 3db</b> <p>compatible profiles:a2dp, avrcp, hsp, hfp</b> <p>transmission distance:33 ft(10m)</b> <p>battery:rechargeable lithium ion, 250mah</b> <p>continuous play:3-4 hours(normal volume)</b> <p>standby time:10 days</b> <p>charge time:2 hours </b> <p>weight:1.128 oz(32g)</b> <p>water proofing grade: ip67</b> <p>bluetooth version:csr4.1,dual bluetooth pairing</b> <p>working temperatur:-10°c-+50°c humidity 0-90%</b> <p><b>package list</p></b> <p>1x bone conduction glass</b> <p>2x transparent lens model</b> <p>1x usb cable for charging</b> <p>1x english user manual</b> <p>1x anti skid raised nose pad</b>