Specifications: Splendid ambient noise isolation. Earmuffs used with skin-friendly leather material, and super soft Over-ear pads that are more comfortable for long time wear. Durable tensile effectively reduces the external resistance; prevents the line from twining. The line is equipped with a rotary volume controller, one key Mic mute, more convenient to use. Exquisite craftsmanship and fashion appearance. Features: Bluetooth 4.2 Matte surface, excellent touch. Built-in Microphone to receive calls Built-in FM Radio Supports Micro SD Card (SD Card is Not included) High Definition Stereo Sound Charged via USB rechargeable battery, convenient and practical Fordable design and adjustable length hinges, very comfortable to wear and easy to carry Listen to music from your phone, TV or computer as long as they have Bluetooth Connectivity; 3.5mm audio jack Best choice for listening to music, watching a movie, chatting online etc  Specification: Bluetooth version: 4.2. Color: Black&Red / Black&Blue / Green / Grey&Red / Grey&Blue Bluetooth Working distance : up to 10 Meters Sensitivity: 105dB+ / - 3dB Rechargeable lithium battery: 300mAh Charge time: 2-3hours Standby Time: Up to 72 hours Working time: up to 4~5 hours Charge port: USB Plug type: 3.5mm Audio cable length: 1.2m / 3.94ft Earmuff diameter: 8cm / 3.1inch Microphone: Built-in Package Included:   1 x Bluetooth Earphone (Retail Box)  1 x USB Charging Cable  1 x 3.5mm Audio Cable