Codec support is the headline here: under Bluetooth 5.4 the MOMENTUM True Wireless 4 carries aptX Adaptive/Lossless alongside LC3, with Auracast available after a firmware update. Each bud weighs 6.2 g, runs a 7 mm TrueResponse dynamic driver, is rated IP54 for dust and splashes, and charges from a case that takes both USB-C and Qi wireless.
Key features
Bluetooth 5.4 with aptX Lossless and LC3
Supported codecs are SBC, AAC, aptX, aptX Adaptive/Lossless and LC3. LC3 is the new low-power audio standard, while aptX Lossless carries a lossless stream when conditions allow — both depend on your phone supporting them. Sennheiser lists Auracast as available via firmware update only, so it is not an out-of-the-box feature.
7 mm TrueResponse drivers
Each bud uses a 7 mm TrueResponse dynamic driver covering 5 Hz to 21 kHz, rated at 107 dB SPL (1 kHz / 1 mW) with THD below 0.08% at 1 kHz / 94 dB. That distortion figure is low for a true wireless earbud, and it shows in vocals and strings that keep their detail instead of sounding compressed.
30 hours total and wireless charging
The buds run up to 7.5 hours with ANC off and up to 7 hours with ANC on, for up to 30 hours of total playtime with the case. Batteries are 75 mAh per earbud and 820 mAh in the case. An 8-minute quick charge returns about an hour of playback, and the case accepts USB-C or Qi wireless charging.
Three mics per bud, IP54, app control
Each earbud carries three microphones with beamforming, feeding a hybrid adaptive ANC system. The IP54 rating covers dust and splashes, which is enough for hiking, running or walking through rain, though not for swimming. The Sennheiser Smart Control app on iOS and Android handles tuning and settings.
Specifications
| Item | Specification |
|---|---|
| Transducer | TrueResponse dynamic, 7 mm |
| Frequency response | 5 Hz – 21 kHz |
| Sensitivity | 107 dB SPL (1 kHz / 1 mW) |
| THD | < 0.08% (1 kHz / 94 dB) |
| Bluetooth | 5.4 compliant, class 1 |
| Codecs | SBC, AAC, aptX, aptX Adaptive/Lossless, LC3 |
| Auracast | Available via firmware update only |
| Earbud playtime | Up to 7.5 hrs (ANC off); up to 7 hrs (ANC on) |
| Total with case | Up to 30 hrs |
| Quick charge | 8 minutes for about 1 hour |
| Battery | 75 mAh per earbud; 820 mAh case |
| Charging | USB-C and Qi wireless |
| Microphones | 3 per earbud, beamforming |
| Noise cancelling | Hybrid adaptive ANC |
| Ingress protection | IP54, dust and splash resistant |
| Weight | 72.4 g total; 6.2 g per earbud |
| Dimensions | 70.1 × 44.6 × 34.8 mm |
| App | Sennheiser Smart Control (iOS / Android) |
Who it's for
- Android users whose phones support aptX Adaptive/Lossless and want the higher-rate link on true wireless.
- Anyone using one set for commuting, errands and light training who needs IP54 protection.
- Buyers who want something small — 6.2 g per bud and a case that disappears in a pocket.
- Who it isn't for: people who want all-day playback on one charge. At up to 7.5 hours per bud a long flight means a mid-journey return to the case, and this is not rated for submersion.
Warranty and delivery
International version · 10-day exchange for faulty units · 100% brand new · viewing by appointment at our Kwun Tong shop. Full terms on the warranty policy page.
Non-TV items ship by SF Express freight-collect (the customer pays the shipping fee), or you can collect at the Kwun Tong shop free of charge, 11:00–19:00. For any other courier arrangement, or delivery to Macau, message us on WhatsApp. Full terms on the shipping policy page.
FAQ
How much water does IP54 actually cover?
IP54 means dust protection plus resistance to splashing water from any direction, so sweat, drizzle and splashes at the sink are fine. It is not an immersion rating — do not wear them swimming, in the shower, or anywhere they go under water.
Will I definitely get aptX Lossless?
That depends on your phone. aptX Adaptive/Lossless needs support on the transmitting side, which today means certain Android devices; iPhones use AAC. Check what your handset supports before buying, or that part of the specification stays unused.
Does Auracast work straight out of the box?
No. Sennheiser lists Auracast as available via firmware update only, so after unboxing you will need the Sennheiser Smart Control app to check for and install firmware. Before that update the option may not appear in the app's settings.