Bose QuietComfort 45 Wired & Wireless Bluetooth Headset in Black 2560 x 1440 Master (outer) case length: 315 Master (outer) case length: 315 mm 7 A Energy efficiency scale A to G Energy efficiency class (SDR) D Energy efficiency class (HDR) Not available Energy consumption (SDR) per 1000 hours 10 kWh Operational conditions Non operating altitude 0 12192 m Operating temperature (T T) 0 40 °C Storage temperature (T T) 20 60 °C Operating relative humidity (H H) 10 80% Storage relative humidity (H H) 5 90% Operating altitude 0 5000 m Packaging content Stand included Yes Manual Yes Cables included AC Bass stays consistent when you turn down the volume and the music is still clear when you turn it up and videos