Features: Foldable high definition wireless stereo Bluetooth on-ear headphones; Allows you to enjoy digital-quality music wirelessly and convert between music and phone calling mode freely; Helps to reduce radiation while answering calls; Supports FM radio can receive high-quality stereo radio; Supports Bluetooth stereo devices to receive A2DP stereo music from laptop computer desk computer Tablet PC IPHONE Blackberry Bluetooth adapter MP3 player or any other device that supports Bluetooth stereo audio; Allows you to conveniently answer calls or listen to music while doing sports; Built-in high quality MP3 decoder; Directly plays MP3 music from an external TF card; Extra soft cushions for superb comfort and acoustics; Charged via the micro USB / USB2.0 charging port; On-ear design for a comfortable fit Bluetooth: V2.1+EDR Working Range: 10M Headset Type: On-ear Range of Frequency: 2.4-2.4835GHz ISM band Frequency Response: 20Hz~20KHz Sensitivity: -85dB MP3/FM PC Interface: USB 2.0 Music Format: MP3/WMA TF Card Support: 128MB-32GB FM Frequency Response: 87.5-108MHz Rechargeable Lithium Battery: 350mAh Speaker: Φ40mm Sensitivity: 115dB S.P.L at 1KHz Impedance: 32ohm Rated Power: 40mW Power Capacity: 100mW Cable Length: 1.5m Microphone Unit: 4.5mm x 2mm -58dB+/-3dB Plug Type: Φ3.5mm Stereo