Bose A20 Aviation 2015-present Owner's guide - Page 18

Using the Headset Power indicator New alkaline AA batteries will generally supply at least 45 hours of power for the headset. Battery life varies with the ambient noise level of the aircraft, temperature, ear cushion condition, use of the Bluetooth® feature, and age of the batteries. The power indicator changes color to indicate the power status, as follows: Indicator color Power source Type of light Indicates Green Aircraft Slow flashing Power ON Green Battery Flashing Power ON and batteries good Amber Battery Fast flashing Power ON, but batteries low (8 hours or less remaining) Red Battery Very fast Power ON, but batteries very low* flashing (2 hours or less remaining) Off None None Power OFF or batteries depleted Warning: Replace batteries with alkaline batteries only. Do not use any other ­battery chemistries. *When the batteries reach this level, the Bluetooth feature is disabled to conserve remaining power. You will hear a tone, indicating that your Bluetooth device is ­being disconnected and the Bluetooth feature is turning off. Intercom volume controls The left and right volume control wheels on the control module adjust the intercom volume of the corresponding earcup. With Acoustic Noise Cancelling® off, volume control will be set to the maximum level. Caution: Avoid setting the volume levels too high. Exposure to loud sounds may cause hearing damage. Holding the control module upright and facing you: • Use the left wheel to adjust volume of the left earcup. • Use the right wheel to adjust volume of the right earcup. Overall headset volume control requires adjustments at both the aircraft intercom or radio, and at the headset control module. Even at its lowest setting, neither volume control wheel can completely turn off the volume. 18 - English