Life n Soul BE501-Co Bluetooth Headphones, Chrome Powerful 8 neodymium dynamic drivers by Life n Soul Sound Lab, with 2 woofers and 6 drivers. Creates HD audio and a wide frequency response from 10 to 22 kHz through the built-in lossless transmission technology aptX audio suppression solution. Bluetooth 4.0 Ultra low energy technology. Up to 1300hrs ultra-long standby time and up to 28hrs Bluetooth music playtime. Dynamic Surround Sound (DSS)