THE HIGHEST AUDIO QUALITYIxir uses the highest quality transducers and hardware, as well as Bluetooth 4.1, and A2DP stereo transfer protocols. That means bigger bass, lighter-than-air treble, deliver crisp, clear music to your ears via a smooth, skip-free connection and perfect phone call.THE NEWEST ADVANCED TECHNOLOGYStable Connected with Bluetooth 4.1 CSR technology brings to long time working with 1-2 hours recharge, can be used for up to 5 hours playing time, 250 hours standby time. Powerful Bluetooth signal with up to 33 feet operation distance. No playback, No weak batteries, No dropped phone calls*Please notePlaytime varies according to volume level and audio content.COMFORTABLE SECURE FIT DESIGNErgonomic and flexible in-ear design, soft silicone angled earbuds and the over-ear hook for universal fit guarantees a firm, secure fit to your ears, enables comfortable wearing without falling out.THE EASIEST WAY TO MANAGE BATTERY LIFE.Our new technology interfaces with Apple iOS and latest Android devices to show you at a glance how much battery life is left in your headset.WATER RESISTANTIPX4 Nano coating ensures complete defense against sweat or rain. Push yourself to your limit during workouts and With Ixir Headphones will handle your audio effortlessly.