[Bluetooth 4.1+aptx]: Supports two connected devices simultaneously and allows to automatically connecting after paired successfully for the first time, high-fidelity stereo sound quality with aptx codec. The Headphones are compatible with most cell phones, iPhone and Android.[Long-Lasting Usage & Lightweight Design]: Up to 6 hours talk time / music time (Playtime varies according to volume level and audio content). With 150 hours standby time and 1-2 hours charging time. Since it has a super Light Weight Design, the net weight is only 3.52 ounces; you will feel nothing for gym and workout.[Built-in Magnets Design]: You can attach the two headphones together when not using, and wear like a necklace around your neck, a convenient way to carry around when you don't need them.[Sweat Resistant]: Built for your active lifestyle, the earbuds are rated IPX Level 4 and can withstand dripping sweat. Ergonomic design optimized for ultimate wearing comfort to match your active lifestyle like running, jogging, cycling, driving, camping, hiking gym exercise and other outdoor sports[In-line Mic and Volume Control]: The headphones have a mute button and slide volume control button perfect for you answer the call or listening.