Ultimate Ears UE9000 Noise-Cancelling Wireless Headphones

TECHNICAL SPECIFICATIONS WIRELESS RANGE:50 feet (15 meters) HEADPHONE TYPE:Around-the-ear DRIVER DIAMETER:40mm IMPEDANCE:32 ohms, 1 kHz SENSITIVITY:105 dB SPL/mW, 1 kHz FREQUENCY RESPONSE:20 Hz - 20 kHz CONNECTION:Bluetooth or 3.5 mm (1/8 inch) NOISE ISOLATION:14dB BATTERY TYPE:rechargeable battery pack (included) BATTERY LIFE:over 20 hours of listening with analog input, over 10 hours of listening with wireless connection* * Actual battery life will vary with use, settings and environmental conditions. Rechargeable batteries have a limited number of charge cycles.