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 feature 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 case. Features: Wireless Bluetooth connectivity Noise cancelling, perfect for cutting out low noises from planes or trains Dynamic bass technology Internal rechargeable battery with up to 8 hours playback SD card slot (max capacity 32GB) Built-in microphone for hands free calls Folds away for compact storage Specification: Power supply Internal rechargable Lithium Ion battery Battery life : Bluetooth playback Up to 4 hours Battery life : SD card playback Up to 8 hours Speaker size 40mmØ dome Frequency response 12Hz - 22kHz Sensitivity 108dB/mW Impedance 32 Ohms at 1kHz Connections Bluetooth, 3.5mm stereo jack, micro USB for charging Bluetooth version 3.0 Bluetooth range Up to 10m (clear line of sight Dimensions 190 x 150 x 70mm Weight 142g In the box: ​Wireless headphones 1.2m 3.5mm stereo jack lead 0.5m USB charging lead Carry pouch User guide