Boult Audio Z40 Ultra

Name: Boult Audio Z40 Ultra
Brand: Boult Audio
SKU: 49452

Manufacturer: Boult Audio

The Boult Audio Z40 Ultra are true wireless in-ear earbuds designed for everyday use without the hassle of cables. Built around a 10 mm driver unit, they cover a standard frequency range of 20 Hz to 20,000 Hz and include both active and passive noise reduction to help minimize unwanted ambient sound. The earbuds carry an IPX5 rating, making them resistant to sweat during physical activity.

On the connectivity side, the Z40 Ultra uses Bluetooth 5.3 with a maximum range of 10 meters and supports multipoint pairing with up to two devices simultaneously. Audio latency sits at 45 ms, and USB Type-C is used for charging. The earbuds themselves last up to 8 hours per charge, while the included case extends total playback to 92 hours. Fast charging is supported, and a full charge takes around 2 hours. A quad-microphone setup with noise cancellation handles calls, and additional features include an ambient sound mode, a mute function, voice prompts, and touch controls placed directly on the earbuds.

Pros

The charging case extends total battery life to 92 hours, making it practical for extended travel or infrequent charging
Supports simultaneous connection to two devices via multipoint pairing, useful for switching between a phone and laptop
Includes both active noise cancellation and passive noise reduction for two layers of sound isolation
A quad-microphone setup with noise cancellation improves voice clarity during calls
Fast charging support reduces downtime when the battery runs low
A travel bag is included in the box, adding convenience for portability

Cons

No wireless charging support, requiring a wired connection every time the earbuds need to be charged
The earbuds lack in/on-ear detection, so music will not pause automatically when removed
No high-resolution audio codec support such as LDAC, aptX HD, or AAC, limiting audio transmission quality
Bluetooth range is limited to 10 meters, which may be restrictive in certain use cases
No find device feature, making it harder to locate misplaced earbuds

Who is this for?

These earbuds are well-suited to users who spend long hours away from a power source, thanks to a 92-hour total battery capacity via the charging case and fast charging support. People who frequently switch between devices will benefit from multipoint pairing, which allows seamless connection to two devices at once. The IPX5 sweat resistance and in-ear fit also make them a practical option for active daily use and light workouts, while the quad-microphone system with noise cancellation serves those who rely on their earbuds for calls throughout the day.

Who is this NOT for?

Users who prioritize high-fidelity audio will find these earbuds limiting, as they lack support for any advanced audio codecs such as LDAC, aptX HD, or AAC, which restricts audio transmission to standard quality. The absence of in/on-ear detection and a find device feature makes them less practical for users who frequently remove their earbuds or tend to misplace them. Additionally, the 10-meter Bluetooth range and lack of NFC or fast pairing mean these earbuds are not the best fit for users who need flexible, wide-range wireless connectivity in larger spaces or demand quick, effortless device pairing.

Design:

Fit	In-ear
Ingress Protection (IP) rating	IPX5
water resistance	Sweat resistant
has no wires or cables	✓
are neckband earbuds	✕
wingtips included	✕
has stereo speakers	✓

The Boult Audio Z40 Ultra adopts a true wireless, in-ear fit with no cables or neckband, keeping the design minimal and unencumbered. The earbuds do not include wingtips, relying solely on the in-ear form factor for placement. They feature stereo speakers and carry an IPX5 ingress protection rating, which means they are built to handle sweat during workouts or daily activity, though they are not rated for submersion in water.

Sound quality:

has active noise cancellation (ANC)	✓
has passive noise reduction	✓
driver unit size	10 mm
lowest frequency	20 Hz
highest frequency	20000 Hz
has a neodymium magnet	✕

The Boult Audio Z40 Ultra is equipped with a 10 mm driver unit and covers a frequency range of 20 Hz to 20,000 Hz. It supports both active noise cancellation (ANC) and passive noise reduction, offering two layers of sound isolation during use. The drivers do not use a neodymium magnet.

Power:

Battery life	8 hours
Battery life of charging case	92 hours
charge time	2 hours
has wireless charging	✕
has a battery level indicator	✓
has a rechargeable battery	✓

The Boult Audio Z40 Ultra houses a rechargeable battery that delivers up to 8 hours of playback per charge, while the included charging case extends the total capacity to 92 hours. A full charge takes approximately 2 hours, and a battery level indicator lets users keep track of remaining power. Wireless charging is not supported, so the earbuds must be charged via a wired connection.

Connectivity:

has fast pairing	✕
Has USB Type-C	✓
Bluetooth version	5.3
has LDAC	✕
has LDHC	✕
has aptX Adaptive	✕
has aptX Low Latency	✕
has aptX HD	✕
has aptX	✕
has aptX Lossless	✕
audio latency	45 ms
has aptX Voice	✕
maximum Bluetooth range	10 m
supports Bluetooth pairing using NFC	✕
Can be used wirelessly	✓
has AAC	✕

The Boult Audio Z40 Ultra connects wirelessly via Bluetooth 5.3 with a maximum range of 10 meters and an audio latency of 45 ms. It uses USB Type-C for wired charging but does not support NFC pairing or fast pairing. On the codec side, the earbuds do not include AAC, LDAC, LDHC, aptX, aptX HD, aptX Adaptive, aptX Low Latency, aptX Lossless, or aptX Voice, meaning audio is transmitted using the standard SBC codec by default.

Features:

has ambient sound mode	✓
has in/on-ear detection	✕
has find device feature	✕
Supports fast charging	✓
multipoint count	2
has a mute function	✓
can be used as a headset	✓
control panel placed on a device	✓
warranty period	1 years
Has voice prompts	✓
travel bag is included	✓
Has an in-line control panel	✕
Has a temperature sensor	✕

The Boult Audio Z40 Ultra includes an ambient sound mode, a mute function, voice prompts, and touch controls placed directly on the earbuds, while an in-line control panel is not included. It supports multipoint connectivity with up to two devices simultaneously and can function as a headset for calls. Fast charging is supported, and a travel bag is included in the box for portability. The earbuds do not feature in/on-ear detection, a find device function, or a body temperature sensor, and they come with a one-year warranty.

Microphone:

number of microphones	4
has a noise-canceling microphone	✓

The Boult Audio Z40 Ultra is fitted with a quad-microphone setup that includes noise cancellation, helping to reduce background sound during calls and voice interactions.

Final Verdict

The Boult Audio Z40 Ultra is a feature-conscious set of true wireless earbuds that covers the essentials for everyday use. Its most compelling attribute is the 92-hour total battery capacity combined with fast charging, making it a reliable choice for users who prioritize endurance over frequent top-ups. Active noise cancellation, a quad-microphone setup, multipoint pairing, and sweat resistance round out a solid package for commuters, remote workers, and active users alike. Where it falls short is in audio codec support and peripheral conveniences like in-ear detection and device tracking — areas that more discerning listeners or frequent multitaskers may find limiting. Taken as a whole, the Z40 Ultra is a dependable everyday companion for those who value battery life, call quality, and practical wireless features.