PRODUCT OVERVIEWFreedom. Convenience. The big advantages of wireless headphones. But Bose gives you a better wireless experience all around. Deep, immersive sound at any volume. Clearer calls at both ends of the communication. Seamless switching between two connected Bluetooth devices, so you'll never miss a call or that movie you're watching. Once you hear them, we think you'll agree they're the best-sounding wireless headphones you'll find anywhere.KEY FEATURESDeep, immersive sound, improved eq-best-in-class performance for wireless headphones. Connectivity Technology: Wired/WirelessLatest Bluetooth technology for easy connectivity and seamless audio/video syncs. Wireless range up to 9m (30 feet)Advanced microphone system, HD voice for clear calls in windy or noisy environments.Recharge Time 3.0 HoursUp to 15 hours of playtime with a rechargeable lithium-ion batterySwitch between two Bluetooth devices to watch a video while staying connected to your smartphone.