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Boult Audio Z35 specifications and in-depth review

Boult Audio Z35

Manufacturer: Boult Audio

The Boult Audio Z35 are true wireless in-ear earbuds designed for everyday use, offering a cable-free listening experience with sweat resistance rated at IPX5. They come with a charging case that extends total playback to 24 hours, making them a practical option for users who need reliable audio throughout the day. A travel bag is included in the box, and the earbuds carry a 1-year warranty.

Each earbud uses a 13mm driver covering a frequency range of 20Hz to 20,000Hz, with passive noise reduction to help block ambient sound. Connectivity runs over Bluetooth 5.3 with a maximum range of 10 meters and a 45ms audio latency, though advanced codecs such as aptX, LDAC, and AAC are not supported. Charging is handled via USB Type-C and takes 1.5 hours, with fast charging also supported. The dual-microphone setup includes noise cancellation for calls, a mute function is available, and voice prompts and a battery level indicator are built in.

Pros
  • The charging case extends total playback to 24 hours, making the earbuds practical for extended use without needing access to a power outlet
  • Fast charging support helps reduce the time spent waiting for the earbuds to be ready for use
  • IPX5 sweat resistance makes them suitable for workouts and active use without concern for moisture damage
  • Dual microphones with noise cancellation help keep call audio cleaner in environments with background noise
  • USB Type-C charging is used, which is a widely available connector for modern devices
  • A travel bag is included in the box, providing a convenient way to store and carry the earbuds
Cons
  • Active noise cancellation is not available, so the earbuds rely solely on passive isolation from the in-ear fit to block out ambient sound
  • No advanced audio codecs are supported — aptX, AAC, LDAC, and all their variants are absent, limiting wireless audio quality options
  • Fast pairing and NFC pairing are not supported, requiring a standard manual Bluetooth pairing process each time
  • There is no ambient sound mode, which means users cannot hear their surroundings without removing the earbuds
  • The find device feature is missing, so locating misplaced earbuds through an app or audio signal is not possible
  • In/on-ear detection is absent, so music will not automatically pause when the earbuds are removed
Who is this for?

The Boult Audio Z35 is a practical fit for users who want a no-fuss wireless listening experience for daily commutes, light exercise, or casual use. The IPX5 sweat resistance makes them a reasonable choice for gym sessions or outdoor activity, while the combined 32 hours of playback between the earbuds and charging case suits users who spend long stretches away from a power source. Those who frequently take calls on the go will benefit from the dual noise-canceling microphones and mute function, and the included travel bag adds a small but useful layer of portability for everyday carry.

Who is this NOT for?

Users who prioritize audio fidelity will find the Z35 limiting, as the absence of any advanced codec support — including aptX, AAC, and LDAC — means wireless audio quality is restricted to the standard Bluetooth SBC transmission. The lack of active noise cancellation makes these earbuds unsuitable for environments with persistent background noise, such as open offices, flights, or busy transit, where passive isolation alone may not be sufficient. Additionally, users who value smart features like auto-pause on ear removal, an ambient sound mode, or a device-finding function will not find any of those capabilities here.

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 Z35 are true wireless in-ear earbuds with no cables or neckband, featuring stereo drivers and an IPX5 ingress protection rating that makes them sweat resistant during physical activity. Wingtips are not included, so fit relies entirely on the in-ear design.

Sound quality:

has active noise cancellation (ANC) ✕
has passive noise reduction ✓
driver unit size 13 mm
lowest frequency 20 Hz
highest frequency 20000 Hz
has a neodymium magnet ✕

The Z35 uses a 13mm driver unit covering a frequency range of 20Hz to 20,000Hz, and relies on passive noise reduction through its in-ear fit to attenuate ambient sound. Active noise cancellation is not available, and the drivers do not use a neodymium magnet.

Power:

Battery life 8 hours
Battery life of charging case 24 hours
charge time 1.5 hours
has wireless charging ✕
has a battery level indicator ✓
has a rechargeable battery ✓

The earbuds offer 8 hours of battery life per charge, with the charging case providing an additional 24 hours for a combined total of 32 hours of playback. A full charge takes 1.5 hours, and fast charging is supported to reduce downtime. The battery is rechargeable, a battery level indicator is included, and wireless charging is not available.

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 Z35 connects wirelessly via Bluetooth 5.3 with a maximum range of 10 meters and an audio latency of 45ms. Charging uses USB Type-C, and the earbuds can be used entirely wirelessly. Neither fast pairing nor NFC pairing is supported, and advanced audio codecs including AAC, aptX, aptX HD, aptX Adaptive, aptX Low Latency, aptX Lossless, aptX Voice, LDAC, and LDHC are all absent from this model.

Features:

has ambient sound mode ✕
has in/on-ear detection ✕
has find device feature ✕
Supports fast charging ✓
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 Z35 supports fast charging and can function as a headset for calls, with controls placed directly on the earbuds and voice prompts to assist with navigation. A mute function is available, and a travel bag is included in the box. The earbuds come with a 1-year warranty. Ambient sound mode, in/on-ear detection, a find device feature, an in-line control panel, and a body temperature sensor are not part of this model's feature set.

Microphone:

number of microphones 2
has a noise-canceling microphone ✓

The Z35 is fitted with two microphones and includes noise cancellation on the microphone to help reduce background sound during calls.

Final Verdict

The Boult Audio Z35 are true wireless earbuds that keep things straightforward, focusing on the essentials rather than an extended feature set. Their most practical strengths lie in the 32-hour combined battery life with fast charging support and the IPX5-rated sweat resistance, which together make them a dependable option for active, everyday use. The dual noise-canceling microphones add genuine utility for calls, and the inclusion of a travel bag and USB Type-C charging reflects a thoughtful approach to daily carry. That said, the absence of advanced audio codecs, active noise cancellation, and smart earbud features means the Z35 is best understood as a functional, no-frills option suited to users whose needs don't extend far beyond reliable wireless playback and basic call handling.