Bluetooth Headphones, AVANTEK In-Ear Sports Earbuds with Over 8-Hour Playtime, Extremely Lightweight, Superb Sound and Noise Cancellation, Bluetooth 4.1 with aptX Stereo headphones deliver rich, dynamic sound with crystal-clear highs, vigorous mids perfectly seals the ear canal and guarantees a superior audio experience for an immersive listening experience Attractive and extremely lightweight design provides a snug, comfortable fit  ultra-soft ear buds (includes 4 pairs, Extra Small/Small/Medium/Large) ensure maximum comfort and long-term use Specially formed ear hooks ensures improved grip  ear hooks can be rotated and bended along ear contours to find the most suitable position for any wearer; includes a carrying case for easy storage and a cable clip for enhanced grip while Jogging, driving or during household chores Easy access to controls, including built-in microphone, volume, pause, skip, and telephone  conveniently stream music, listen to podcasts or use your phone hands-free; able to connect with two cell phones simultaneously Compatible with all iOS devices and Android smartphones; supports 8 hours of music playtime or 8.5 hours of talk time without a recharge and lasts up to 250 hours in standby mode