Syllable Bluetooth Headphones (S2-BK) BLUETOOTH 4.2 TECHNOLOGY: Supports two connected devices simultaneously and allows to automatically connecting after paired successfully for the first time LONG-LASTING USAGE & LIGHTWEIGHT DESIGN: Long lasting talk time / music time (Playtime varies according to volume level and audio content); 120 hours standby time and 1-2 hours charging time; Super Light Weight Design take you will feel nothing for gym and workout COMFORTABLE AND SECURE MAGNETIC DESIGN: These Noise Canceling earbuds include S/M/L ear tips and two types of different ear hooks to ensure a comfortable and secure fit for everyone. With specially designed ear hooks, you will never worry about the ear buds falling off in a gym or workout again. It is also let you attach the two headphones together with built-in magnet inside when not using, and wear like a necklace around your neck, a convenient way to carry around when you don't need them IPX4-RATED 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 HD STEREO & NOISE CANCELLATION: Adopted CVC Version 6.0 NOISE CANCELLATION technology, guarantees HD stereo sound quality and provides steady Bluetooth signal and provides steady Bluetooth signal and support stereo loss less music. The Headphones are compatible with most cell phones, iPhone and Android