¹Testing conducted by Bose in June 2024 using production-representative Bose QuietComfort Earbuds and IEC60268-1 pink noise using A2DP Bluetooth audio. Volume set to playback loudness of 75 dBSPL, 3-band EQ set to zero, in Quiet Mode (full noise cancellation). Playback time was up to 9 hours before battery depletion. Battery life varies based on settings and usage.
²Testing conducted by Bose in June 2024 by inserting production-representative Bose QuietComfort Earbuds with battery depleted (to the point of no audio playback) into a fully charged Bose QuietComfort Earbuds charging chase and charging earbuds to 100%, then resuming audio playback until battery depletion. Testing resulted in 2.5 complete charging cycles by the case before a full charge was no longer possible.
³Testing 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 dBm. 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.