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Black open-ear wireless earbuds with charging case, touch controls, IPX5 rating

Monster AC311 Open Ear Headphones Bluetooth 5.4 30h IPX5 Black

SKU CH-04H6-ZS856

Open-ear headphones with Bluetooth 5.4, environmental noise cancellation, IPX5 sweat resistance and 30 hours of playtime

  • Power supplyBattery, true
  • ConnectionNo Jack
  • Wearing styleOpen ear
  • Noise cancellationEnvironmental noise cancellation
  • Wireless technologyBluetooth
  • Battery pack30 h
  • Clear calls with 16.2 mm driver and environmental noise cancellation
  • 30 hours total playtime via Type-C charging case
  • Bluetooth 5.4 for fast, stable wireless connection
  • IPX5 rated against sweat and light rain
  • Open-ear comfort with high-elasticity fit that avoids ear pressure

What you get

The Monster AC311 open-ear headphones use a 16.2 mm dynamic driver and air conduction to deliver stereo sound while leaving the ear canal free. Bluetooth 5.4 handles the wireless link and a Type-C case provides up to 30 hours of total playtime.

Who they suit

Listeners who want ambient awareness for running, cycling or office use will appreciate the lightweight hook design and IPX5 sweat resistance. Buyers who need active noise cancellation or in-ear isolation should look at a different style.

The deciding spec

The open-ear coupling means audio leaks out and outside noise leaks in, so these are the right part only if staying aware of your surroundings matters more than privacy or bass impact.

How it compares

Measured against everything we stock in Earbuds & Over-Ear Headphones, at today’s prices. Recalculated every night.

Price $23.99
Typical for this category: the median of 7,078 items is $25.99.

Specifications

Product
Brand nameMonster
Model nameAC311
Product colorBlack
Audio & video
Wearing styleOpen ear
Noise cancellationEnvironmental noise cancellation
Connectivity
Wireless technologyBluetooth
Ports & slots
ConnectionNo Jack
Power
Power supplyBattery, true
Battery pack30 h
Run time30 h
Charging time8 h
Built-in batteryBattery

Questions about this item

Which version of the Monster AC311 should I choose for the longest playtime?

The AC311 delivers up to 30 hours of total playback with the charging case on a single charge.

What does the 16.2 mm driver actually give me in daily use?

The large 16.2 mm driver produces rich air-conduction audio so music and calls stay clear even on busy streets.

How does Bluetooth 5.4 affect connection stability and latency?

Bluetooth 5.4 provides faster pairing, a wider wireless range and minimal latency for perfectly synced sound.

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