-FEATURES*4 in 1 Multifunctional stereo Bluetooth Headphone: Wireless Stereo Bluetooth + Card MP3 player + FM Radio + 3.5mm audio Wired Headset functio*Be designed with High-grade speaker and built-in Microphone, Powerful Bass system, bring you superior sound effect. Best choice for listening to music / FM Radio, watching movie, chatting online, etc.*Easy to pair with almost any Bluetooth-enabled audio / music players devices, such as, Smart Phones, Tablet PC, Laptop, Notebook, etc.*Supports hands-free function, conveniently answer the incoming call during travel.   *High-quality, folding design and adjustable headband length, comfortable to wear and easy to carry. Headband Headset Specification:Model Number:STN-13Type: Bluetooth Headphone with Microphone.Bluetooth version:V3.0+EDRFrequency response:2.4-2.4835GHz ISM bandRange TF card supported: 128M-32GBDistance:10/20mSensitivity:-80dBmSepcification:Music format supported:MP3/WMASlot: USB2.0FM radio range supported:87.5-108.0MHzDriver unit:40mm DiameterBattery Capacity: 250mAhDriver unit:40mmSensitivity:115db S.P.L. at 1kHzImpedance:320HMMic unit:4mm*1.5mm -42dBRater power:40mwFrequency range:20HZ-20KHzPlug type:3.5mm