Noise Cancelling- Perfect For Cutting Out Low Noises From Planes Or Trains. Wireless Bluetooth Connectivity. Internal Rechargeable Battery With Up To 8 Hours Playback. SD Card Slot (Max Capacity 32Gb). Built-In Microphone For Hands Free Calls. Dynamic Bass Technology. Folds Away For Compact Storage. These incredible rechargeable wireless headphones are great for listening to your music while 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.. bluetooth headphone