These incredible rechargeable wireless headphones are great for listening to your music whilst on the move. Pair via Bluetooth with your smart device and control your media with the MP3 function control keys on the edge of the earcup. Alternatively play MP3 or WAV media files from a micro SD card using the slot in the side of the earcup. In-built is an FM radio and a microphone allowing hands free calls. These headphones offer a fantastic listening experience with dynamic bass technology. The noise cancelling effect blocks out background noise making them perfect for use on public transport. Lightweight and comfortable, you can relax into your music, and when you are done, fold them away and store in the carry pouch.Speaker size: 40mmØ domevbCrLfFrequency response: 12Hz - 22kHzvbCrLfSensitivity: 108dB/mWvbCrLfImpedance: 32 Ohms at 1kHzvbCrLfConnections: Bluetooth, 3.5mm stereo jack, micro USB for chargingvbCrLfWeight: 142gvbCrLfDimensions: 190 x 150 x 70mmvbCrLfPower supply: Internal rechargable Lithium Ion batteryvbCrLfBattery life : Bluetooth playback: Up to 4 hoursvbCrLfBluetooth version: 3.0vbCrLfBluetooth range: Up to 10m (clear line of sight)vbCrLfBattery life : SD card playback: Up to 8 hoursColour: Blue