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Black true wireless earbuds in matching charging case, ABS+PC shell, 13 mm drivers, Bluetooth 5.1

UMIDIGI

UMIDIGI Bluetooth 5.1 True Wireless Earphones Black

SKU CH-BV1D-AWQGH

True wireless earphones with Bluetooth 5.1, a 13 mm driver, 2.5 hour playtime and a charging case that adds three full recharges

  • ColorBlack
  • Bluetooth 5.1 delivers stable audio up to 15 m range
  • 13 mm drivers reproduce full 20 Hz-20 kHz frequency response
  • Charging case provides three full recharges for extended listening
  • Each earphone weighs only 7 g for comfortable all-day wear
  • Compact case measures 4.4×4.3×2.1 cm for easy pocket storage

Compact True Wireless Design

The UMIDIGI HXSJ Air-S4 earphones weigh seven grams each and measure 3.1 by 1.6 by 1.6 centimetres. A matching charging case adds nineteen grams and fits in a small pocket at 4.4 by 4.3 by 2.1 centimetres. Black ABS plus PC shells keep the set light for daily carry.

Bluetooth 5.1 Pairing And Case Power

Bluetooth 5.1 with A2DP 1.3, HFP 1.6 and HSP 1.2 connects to phones, tablets or laptops within ten to fifteen metres. The Bluetrum 5376 chipset handles stereo audio and calls. The case holds 200 milliampere-hours and recharges the earbuds three times before it needs its own one-and-a-half to two-hour top-up.

Upgrade From Older Wireless Buds

Each bud packs a thirty milliampere-hour cell for two to two-and-a-half hours of playback or talk time and 240 hours of standby. The thirteen-millimetre dynamic driver covers 20 hertz to 20 kilohertz at thirty-two ohms impedance with three milliwatt rated power. Buyers needing longer single-charge sessions or active noise cancellation should look elsewhere.

Highlights

  • Bluetooth 5.1 delivers stable audio up to 15 m range
  • 13 mm drivers reproduce full 20 Hz-20 kHz frequency response
  • Charging case provides three full recharges for extended listening
  • Each earphone weighs only 7 g for comfortable all-day wear
  • Compact case measures 4.4×4.3×2.1 cm for easy pocket storage

Specifications

ColorBlack

Questions about this item

How long does the 30mAh battery in each earbud last during continuous music playback?

Each earbud delivers 2 to 2.5 hours of play or calling time on a full charge.

How much heat or noise do the earbuds produce during all-day use with the charging case?

The earbuds operate silently with no active cooling; the 13mm drivers rated at 3mW typical power generate negligible warmth even during extended sessions.

What device and Bluetooth version are required to pair these earbuds?

Any smartphone, tablet or computer supporting Bluetooth 5.1 with A2DP1.3, HFP1.6 or HSP1.2 profiles will connect within the 10 to 15 metre range.

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