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¹Testing conducted by Bose in October 2023 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 off, playback time was up to 7.5 hours before battery depletion. With Immersive Audio on, playback time was up to 4.5 hours before battery depletion. Battery life varies based on settings and usage.
²Testing conducted by Bose in June 2023 using production-representative Bose QuietComfort Ultra Earbuds and a variety of music tracks using A2DP Bluetooth audio streaming at RSSI signal strength of 75 dB. Volume set to a playback loudness of 75 dB, 3-band EQ set to zero, in Quiet Mode (full noise cancellation). With Immersive Audio off, playback time was up to 6 hours before battery depletion. With Immersive Audio on, playback time was up to 4 hours before battery depletion. Battery life varies based on settings and usage.