Google Pixel Buds 2a / Sennheiser MOMENTUM True Wireless 4

Google Pixel Buds 2a: Pixel Buds 2a in-ear earbuds with a USB-C charging case; the Fog, Berry, Iris and Hazel colours share the same hardware. The Pixel Buds A-Series and Pixel Buds Pro 2 are separate models.

Sennheiser MOMENTUM True Wireless 4: MOMENTUM True Wireless 4 (2024); Black Graphite 700365, White Silver 700366, Black Copper 700367 (Denim and Gold were added later). The over-ear MOMENTUM 4 Wireless and the in-ear MOMENTUM True Wireless 3/5 are separate models.

SpecificationGoogle Pixel Buds 2aSennheiser MOMENTUM True Wireless 4
Release year20252024
TypeIn-ear true wireless; wing-tip stabiliser, four ear-tip sizes (XS, S, M, L) GoogleTrue wireless stereo in-ear earbuds; ear-canal fit with ear fins

The box includes four sets of ear tips (XS/S/M/L) and three sets of ear fins (S/M/L).

Sennheiser
ProcessorGoogle Tensor A1 in each earbud Google—
Driver11 mm dynamic driver GoogleTrueResponse dynamic, 7 mm; 5 Hz–21 kHz; 107 dB SPL (1 kHz / 1 mW)

According to Sennheiser, audio resolution up to 24-bit/96 kHz is supported with a compatible source.

Sennheiser
Noise cancellingActive noise cancellation (Silent Seal 1.5); transparency mode; active in-ear pressure relief

Pressure relief adjusts pressure in the ear canal to reduce the blocked feeling of a sealed in-ear design.

Google		—
ConnectivityBluetooth 5.4; pairs with Bluetooth 4.0+ devices

Full features need an Android 6.0+ phone and a Google account; on iPhone basic listening works but app settings are unavailable.

Google		—
CallsTwo microphones per earbud; Bluetooth super wideband; Clear Calling; wind-blocking mesh

Super wideband carries a wider audio range on calls with compatible Pixel phones.

Google		—
BatteryANC on: 7 hours (20 hours with case); ANC off: 10 hours (27 hours with case); 5 minutes of charging gives 1 hour GoogleUp to 7.5 hours per charge (ANC off) / up to 7 hours (ANC on); up to 30 hours total with the case; lithium-ion, 75 mAh per earbud, 820 mAh case

Times were measured with an iPhone at medium volume (85 dB). According to Sennheiser, 8 minutes of charging gives about 1 hour of playback; the battery protect mode in the app slows charging and slightly lowers maximum capacity to extend battery lifespan.

Sennheiser
Charging caseUSB-C charging; no wireless charging listed Google—
DurabilityEarbuds IP54, case IPX4

IP54 protects against dust and splashing water; the earbuds are not designed to be submerged.

Google		IP54 dust and splash resistance (earbuds only)

The charging case is not covered by the IP rating.

Sennheiser
SensorsCapacitive touch controls; IR proximity sensor for in-ear detection; Hall sensor in the case Google—
Size and weightEarbud 23.1 × 16.0 × 17.8 mm, 4.7 g; case 50.0 × 24.5 × 57.2 mm, 47.6 g with earbuds Google—
UpdatesAutomatic security updates for at least three years from first availability on the US Google Store Google—
ColoursFog, Berry, Iris, Hazel Google—
Noise cancellation—Hybrid ANC, adaptive to surroundings; Transparency Mode

Adaptive mode sets the cancellation level automatically for the surrounding noise; Transparency Mode lets outside sound in without removing the earbuds.

Sennheiser
Bluetooth and codecs—Bluetooth 5.4 (Classic and LE Audio); SBC, AAC, aptX, aptX Adaptive/Lossless, LC3; A2DP, AVRCP, HFP, TMAP, PBP

aptX Lossless needs a Snapdragon Sound phone that supports it; an iPhone uses AAC. According to Sennheiser, Auracast broadcast listening only arrives through a firmware update. Multipoint lets it switch between two devices.

Sennheiser
Microphones—3 MEMS microphones per earbud (6 in total), beamforming noise reduction; 100 Hz–10 kHz Sennheiser
Charging—USB-C socket on the case (5 V, 1,000 mA max) and Qi wireless charging

A USB-C cable is in the box; there is no adapter.

Sennheiser
Weight and size—Single earbud 6.2 g; case 66.4 g; total 72.4 g; 70.1 × 44.6 × 34.8 mm with the case Sennheiser
App—Sennheiser Smart Control for iOS and Android: 5-band EQ, Sound Personalization, Sound Zones, touch control settings

Sound Personalization was developed with Fraunhofer IDMT and builds a sound profile from the user’s reactions to sample sounds.

Sennheiser
Operating conditions—Operating 0 to +40 °C; charging 5 to 35 °C Sennheiser