Jvc bluetooth on ear lightweight headphones enable you to listen wirelessly to your favourite songs giving you dynamic sound reproduction with 30mm neodymium driver units the s40btrsquos have a bass boost function for a truly dynamic bass sound and they are easy to carry because of their flat folding design 17 hours of listening time via the built in rechargeable battery and therersquos also a 4 button operationmic function via bluetooth the s40btrsquos are available in 2 colours flat fo