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Boult Audio K35 specifications and in-depth review

Boult Audio K35

Manufacturer: Boult Audio

The Boult Audio K35 are true wireless earbuds designed for everyday use, sitting comfortably in the ear with a secure in-ear fit and no cables to manage. They carry an IPX5 sweat-resistant rating, making them a practical choice for active use, and come with a travel bag included in the box. The earbuds support fast pairing and connect via Bluetooth 5.3, with a quoted maximum wireless range of 10 metres.

Each earbud houses a 13 mm driver unit covering a frequency range of 20 Hz to 20,000 Hz, and passive noise reduction helps limit ambient sound during listening. On the power side, the earbuds offer 8 hours of playback per charge, with the accompanying charging case extending total usage to 32 hours; a full charge takes 1.5 hours, and fast charging is supported via USB Type-C. For calls, the K35 includes two microphones with noise-cancelling capability, a mute function, and voice prompts, with touch controls placed directly on the earbuds.

Pros
  • Fast charging support reduces downtime when the battery runs low
  • The charging case extends total playback to 32 hours, useful for extended use away from a power source
  • Two noise-canceling microphones help maintain call clarity by reducing background noise
  • Touch controls are built directly onto the earbuds, keeping the setup cable-free and straightforward
  • IPX5-rated sweat resistance makes the earbuds suitable for workouts and physical activity
  • A travel bag is included, providing a convenient way to carry and store the earbuds
Cons
  • No active noise cancellation, so audio isolation relies entirely on the passive seal of the in-ear fit
  • Wireless charging is not supported, requiring a wired connection each time the case needs charging
  • Bluetooth range is limited to 10 metres, which may restrict movement in larger spaces
  • No ambient sound mode means external audio cannot be let in without removing the earbuds
  • The earbuds lack in-ear detection, so music does not pause automatically when they are removed
Who is this for?

The Boult Audio K35 suits users who want a straightforward true wireless experience for daily commutes, gym sessions, or casual listening. The IPX5 sweat resistance makes them a practical fit for those who work out regularly, while the combined 32-hour battery life across the earbuds and case caters well to users who are frequently away from a charging point. Those who regularly take calls on the go will also find value here, as the dual noise-canceling microphones and mute function support clear, hands-free communication without added complexity.

Who is this NOT for?

Users who prioritise audio fidelity through high-quality codec support will find the K35 lacking, as it does not support LDAC, AAC, or any aptX variant, limiting the audio pipeline to standard Bluetooth transmission. The absence of active noise cancellation makes the earbuds ill-suited for consistently loud environments such as planes or busy offices, where passive isolation alone may not be sufficient. Additionally, users who want smart convenience features — such as automatic playback pausing when an earbud is removed, or an ambient sound mode to stay aware of their surroundings — will not find 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 K35 adopts an in-ear fit and operates as a fully true wireless design, meaning there are no cables or neckband involved. The earbuds feature stereo speakers and carry an IPX5 rating, offering resistance to sweat — a practical consideration for use during physical activity. Wingtips are not included with the earbuds.

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 Boult Audio K35 uses a 13 mm driver unit and covers a frequency range of 20 Hz to 20,000 Hz. Passive noise reduction is present, helping to limit unwanted ambient sound during listening, though active noise cancellation is not supported. The earbuds do not use a neodymium magnet in their driver construction.

Power:

Battery life 8 hours
Battery life of charging case 32 hours
charge time 1.5 hours
has wireless charging ✕
has a battery level indicator ✓
has a rechargeable battery ✓

The Boult Audio K35 offers 8 hours of battery life per charge, with the included charging case extending total playback to 32 hours. The rechargeable battery takes 1.5 hours to fully charge, and a battery level indicator is available to keep track of remaining power. Wireless charging is not supported.

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 K35 connects wirelessly via Bluetooth 5.3, supporting fast pairing and reaching a maximum range of 10 metres. Audio latency is rated at 45 ms, and USB Type-C is used for charging. None of the aptX codec variants — including aptX, aptX HD, aptX Adaptive, aptX Low Latency, aptX Lossless, or aptX Voice — are supported, and the earbuds also lack AAC, LDAC, LDHC, and NFC pairing.

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 ✓
Has voice prompts ✓
travel bag is included ✓
Has an in-line control panel ✕
Has a temperature sensor ✕

The Boult Audio K35 supports fast charging and can function as a headset, with controls placed directly on the earbuds and voice prompts to assist with navigation. A mute function is included, and a travel bag comes in the box. The earbuds do not offer ambient sound mode, in-ear detection for auto-pausing, a find device feature, an in-line control panel, or a body temperature sensor.

Microphone:

number of microphones 2
has a noise-canceling microphone ✓

The Boult Audio K35 is equipped with two microphones, and noise cancellation is applied to the mic input to help reduce background sound during calls.

Final Verdict

The Boult Audio K35 positions itself as a no-fuss true wireless option built around everyday practicality. Its 32-hour total battery life combined with fast charging and IPX5 sweat resistance makes it a dependable companion for active, on-the-go users who need reliable playback and call capability without complex setup. While the absence of active noise cancellation and advanced codec support does narrow its appeal for audiophiles or those operating in demanding acoustic environments, the K35 delivers a well-rounded feature set within its scope — dual noise-canceling microphones, touch controls, and a travel bag included out of the box. For users seeking a practical, cable-free daily driver that covers the essentials without overreaching, the Boult Audio K35 makes a coherent and focused case for itself.

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