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Black open-ear wireless earbuds in charging case, 2.4 by 3.96 by 1.3 inches

Monster Open Ear AC336 Black Bluetooth 6.0 21H portable audio

SKU CH-GPE9-2ZEBG

Open-ear wireless earbuds with 13 mm drivers, Bluetooth 6.0, ENC call clarity, IPX6 water resistance and 21 hours total playtime

  • Battery runtime21 h
  • Spec summaryMonster Open Ear AC336, Deep Black, Wireless
  • Playback optionsTouch Control, Touch
  • Wireless technology6
  • Speaker typeDynamic driver
  • Remote controllerTouch Control
  • Open-ear comfort with 13 mm dynamic drivers for immersive stereo sound
  • Bluetooth 6.0 connectivity up to 33 feet with auto pairing
  • ENC noise cancellation for clear calls in noisy environments
  • IPX6 water resistance protects against sweat and rain
  • 21-hour total playtime with 10-minute quick charge for 1 hour

Open-ear stereo earbuds with Bluetooth 6.0

These Monster Open Ear AC336 earbuds use an open-ear design that rests outside the ear canal instead of sealing it. The form factor targets listeners who want all-day comfort and situational awareness during sports, fitness or commuting. They connect to any Bluetooth-enabled phone, tablet, laptop or MP3 player and are finished in black.

Sustained playback and call clarity

A single charge of the buds delivers up to 7 hours of playback at 50-60% volume, while the charging case extends total listening time to 21 hours. The 13 mm dynamic drivers and a dedicated digital audio processor handle continuous stereo output, and Qualcomm aptX HD decoding maintains detail during long sessions. ENC technology filters background noise so voice calls stay clear even after hours of use.

Thermal comfort and power profile

The open-ear architecture avoids trapping heat against the ear canal, so temperature remains comfortable during extended wear. Bluetooth 6.0 provides a stable link up to 33 feet with low latency, and the USB-C case adds roughly 1 hour of playtime after a 10 minute top-up. IPX6 water resistance protects the internals from sweat and rain without adding active cooling or audible fan noise.

How it compares

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

Price $48.99
Pricier than about 60% of the 231 comparable items (median $40.99).
Battery runtime 21 h
Lower than about 65% of the 87 comparable items (median 35 h).

Specifications

Product
Brand nameMonster
Product lineMonster Open Ear AC336
Model nameMonster Open Ear AC336
Part numberMonster E89
Product typeOpen Ear
Product colorBlack
Audio & video
Playback optionsTouch Control, Touch
Speaker typeDynamic driver
Connectivity
Wireless technology6
Power
Battery runtime21 h
Built-in batteryBattery, true, batteries contained in equipment
Size & build
Size and weight2.4 in × 3.96 in × 1.3 in
Compatibility
MP3 supportCompatible with any Bluetooth-enabled device, such as computers, smartphones or tablets, MP3 Player, TV, Laptop
More details
Remote controllerTouch Control
League or teamMaster3

Questions about this item

How much power does the charging case draw when it is plugged in all day?

The case delivers 21 hours of total playtime and gives 1 hour of playback after a 10 minute USB-C charge.

What Bluetooth version must my phone support to pair with these earbuds?

They use Bluetooth 6.0 and work with any Bluetooth-enabled smartphone, tablet, computer or MP3 player.

Will the open-ear design and IPX6 rating still protect the earbuds if I keep using my older sweat-heavy workout routine?

The open-ear fit avoids a tight seal while the IPX6 rating resists heavy splashes and sweat during sports.

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