This SKY-001 Head-mounted Multifunction Wireless V3.0 Bluetooth Stereo Headphone is a kind of powerful wireless Bluetooth headphone. It can connect all devices with Bluetooth function to play music and enable you to enjoy wonderful songs. The built-in concealed high definition microphone makes you answer phones conveniently. Besides that， SKY-001 has built-in MP3 system for inserting memory card to play. It can be changed as a MP3 player as long as you insert a TF card for plying music. What is more， with FM function， it enables you have easy access to news， traffic condition and weather information anytime and anywhere. Never miss it out!                                    Features             High-quality and high elastic sponge noise-proof earmuffs to protect your ears<br> The earmuffs are comfortable to wear for a long time<br> Steel frame to ensure lasting use without deforming <br> ABS outer shell is pliable. Solid and wearable<br> Humanized foldable design for convenient carry<br> Convenient buttons design<br> Retractable design conforms to ergonomics<br> Sponge is effective to reduce pressure to head<br> Support MP3 music format <br>                                                            Specifications             Speaker Diameter     1.57" / 40mm    <br> Sensitivity     115dB S.P.L at 1KHz     <br> PC Intgerface Supports     USB 2.0    <br> Impedance     32ohm    <br> Rated Power     20mW    <br> Power Capability     100mW    <br> Cable Length     29.13" / 74cm    <br> Plug Type     0.14" / 3.5mm    <br> With Microphone     Yes    <br> Weight     7.8oz / 221g    <br> Color     Black    <br> Dimensions     (7.09 x 7.68 x 2.56)" / (18 x 19.5 x 6.5)cm (L x W x H)    <br> Microphone     4.5x2mm， -58dB±3dB    <br> Blutooth Version     V3.0    <br> Effective Distance     8m    <br> Talk Time     5 Hours    <br> Music Playback Time     4 Hours    <br> Support Music Format     MP3    <br> TF Card Support     128MB - 16GB    <br> Operating System     Windows 98/ SE/ ME/ 2000/ XP/ Vista Mac OS 9.2 And Above     <br>                                                             Package Includes            1 x Headphone<br>1 x Charging Line<br>1 x Instructions<br>