Bluedio Turbine T2s Wireless Bluetooth Headphones with Mic・ 57mm Drivers/Rotary Folding<br /><br />1. Foldable & Portable・ 195 rotary design・ to save more space and easy to carry<br /><br />2.  57mm ultra-big speaker・ brings amazing bass for you. But its impedance is only 16 ・ easy to drive by smart phones・ tablets and PCs.<br /><br />3. Bluetooth 4.1・ the latest Bluetooth version・ brings top speed & power saving & enhanced transmission・ superbly compatible with iOS・ Android and Microsoft・ a perfect match for 4G・ standby time up to 1625hrs.<br /><br />4. Comfortable・ Newest Ergonomic design・ together with artificial leather & memory foam to ensure comfortable wearing.<br /><br />5. Line-in audio・ to enjoy music without interruption. Line-out audio・ to share music with your friends anytime<br /><br />Technical specifications:<br />Driver units: 2 speakers(57mm)<br />Transducer type: dynamic<br />Bluetooth version: V4.1<br />Frequency response: 2.4GHz-2.48GHz<br />Operating distance: up to 10m (free space)<br />Profiles: A2DP・ AVRCP・ HSP・ HFP<br />Speaker impendence: 16 <br />Frequency response: 20-20KHz<br />Sensitivity: 110dB<br />THD: <0.1%<br />Music time: about 40hrs<br />Talk time: about 45hrs<br />Standby time: about 1625hrs(around 50days)<br />Fully charged time: about 2hrs<br />Operating environment: -10 to 50    <br /><br />Seller Warranty Description<br />1 year warranty from the date of purchase