¹ Testing conducted by Bose in April 2024 using production-representative Bose Ultra Open Earbuds playing IEC 60268-1 pink noise using A2DP Bluetooth audio streaming at an RSSI of 75 dBm. Volume was set to a playback loudness of 75 dBA and 3-band EQ was set to zero. With Immersive Audio and Auto Volume off, playback time was up to 7 hours before battery depletion. With Immersive Audio or Auto Volume on, playback time was up to 4 hours before battery depletion. With Immersive Audio and Auto Volume on, playback time was up to 3 hours before battery depletion. Battery life varies based on settings and usage.
³ Testing conducted by Bose in October 2023 by removing fully charged production-representative Bose Ultra Open Earbuds from a Bose Ultra Open Earbuds charging case, connecting to a phone with no content playing, and maintaining connection until earbud battery depletion.
⁴ Testing conducted by Bose in April 2024 by inserting production-representative Bose Ultra Open Earbuds with battery depleted (to the point of no audio playback) into a fully charged Bose Ultra Open Earbuds charging case and charging earbuds to 100% (or until the case battery was depleted). Then, the earbuds played IEC 60268-1 pink noise using A2DP Bluetooth audio streaming at an RSSI of 75 dBm until battery depletion. Volume was set to a playback loudness of 75 dBA and 3-band EQ was set to zero. Testing repeated until the case battery was depleted. Additional earbud playback time added through case charging was 18 hours with Immersive Audio off and 12 hours with either Immersive Audio or Auto Volume on, and 9 hours with both Immersive Audio and Auto Volume on.