FSL 360&ordm; Bluetooth Headset / Headphones with One Button Control, Bluetooth 4.0, Aptx, Remote and Mic for All Smartphones - 3 Year Warranty Circumaural (around the ear) design gives a very secure fit, provides extreme comfort for long use, and minimizes sound leakage. They're compatible with all smartphones / tablets and Bluetooth devices. The FSL 360 have the latest Bluetooth V4.0 technology (including aptX) but are backwards compatible with earlier Bluetooth profiles. Sound quality previously only heard in wired headphones due to the advanced PEAQ (Professionally Engineered Audio Quality) technology providing crystal clear HD sound for all musical genres across all volume ranges Integrated microphone for calls (smartphones, mobiles, Skype and VoIP compatible) with built-in remote to skip tracks, adjust volume, play/pause and control calls. Extended battery life of 16 hours talk time / 14 hours music playback with only 2 to 3 hours to recharge. Ultra lightweight and soft cushioned for maximum comfort the FSL 360 contain the most recent Bluetooth technology (V4.0) which is fast, low energy and allows the headphone power bar to show on compatible devices. Package includes hard carry case. Closed back, circumaural design for improved sound isolation cancelling up to 90% of background noise