We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black open-ear wireless earbuds with clip-on design and charging case

Monster AC339 open-ear wireless earbuds, Bluetooth 6.0, 40h, black

SKU CH-WABA-B9H2B

Open-ear clip-on earbuds with Bluetooth 6.0, touch controls, IPX6 water resistance and 40 hours of playback

  • Battery runtime40 h
  • Spec summaryWireless Charging Case, AC339, BLACK, Wireless
  • Playback optionsTouch Control, Touch, touch
  • Wireless technologyBluetooth 6
  • Speaker typeDynamic driver
  • Remote controllerTouch Control
  • Open-ear design keeps you aware of surroundings while listening
  • Bluetooth 6.0 provides faster, more stable connections
  • 40 hours total playback from the charging case
  • IPX6 waterproof rating resists sweat and heavy rain
  • Touch controls handle calls, music and voice assistant

Open-ear wireless earbuds with 40-hour battery

The Monster AC339 are open-ear wireless earbuds that sit outside the ear canal using a clamp-over design. They connect via Bluetooth 6.0 and include a wireless charging case that provides up to 40 hours of total playback. Touch controls handle calls, voice assistant and music playback.

Suited for all-day wear and outdoor activity

The open-ear layout keeps ambient sound audible, which helps office workers stay aware of colleagues and lets runners or cyclists hear traffic. IPX6 water resistance handles sweat and rain during workouts. Buyers who need active noise cancellation or maximum bass isolation should look at closed-back in-ear or over-ear models instead.

Bluetooth 6.0 with wireless charging case

The earbuds use Bluetooth 6.0 for faster, more stable connections and improved energy efficiency. The supplied case charges wirelessly and shows remaining power on a digital display, so you can confirm the 40-hour reserve before leaving home.

How it compares

Measured against everything we stock in Earbuds, Earphones & Mini Speakers, at today’s prices. Recalculated every night.

Price $27.99
Cheaper than about 72% of the 231 comparable items (median $40.99).
Battery runtime 40 h
Higher than about 70% of the 87 comparable items (median 35 h).

Specifications

Product
Brand nameMonster
Product lineAC339
Model nameAC339
Part numberMonster
Product typeWireless Charging Case, Open Ear
Product colorBlack
Audio & video
Playback optionsTouch Control, Touch, touch
Speaker typeDynamic driver
Connectivity
Wireless technologyBluetooth 6
Power
Battery runtime40 h
Built-in batteryTrue, batteries contained in equipment
Compatibility
MP3 supportCompatible with any Bluetooth-enabled device, such as computers, smartphones or tablets, MP3 Player, TV, Laptop
In the box
In the boxWireless Charging Case
More details
Remote controllerTouch Control
League or teamMaster3

Questions about this item

Which Monster AC339 version should I pick for the longest battery life?

The AC339 model provides up to 40 hours of total playback with the wireless charging case included.

What does the 40-hour battery figure mean for daily use?

It represents the combined listening time from the earbuds and the charging case before you need to recharge the case itself.

How does Bluetooth 6.0 affect connection stability and power use?

Bluetooth 6.0 enables faster, more stable connections and improved energy efficiency for longer sessions.

More in Earbuds, Earphones & Mini Speakers

Similar items