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Black semi-in-ear wireless earbuds in a compact charging case

Anker

Anker Soundcore K20i Semi-In-Ear Earbuds Bluetooth 5.3 36H Black A3994

SKU CH-160P-6C4PN

Semi-in-ear wireless earbuds with Bluetooth 5.3 deliver 36 hours of playtime and a 10-minute charge adds 2 hours

  • TypeEarbud
  • ColorBlack
  • Frequency Response20 Hz - 4 kHz
  • Input Impedance16 Ohm
  • Ear CouplingEarbud
  • Weight0.11 Pounds
  • Clear sound from a 13 mm driver with BassUp technology
  • Semi-in-ear fit at 3.3 g per bud for all-day comfort
  • AI-powered dual-mic ENC keeps calls clear in noisy places
  • 22 preset EQs plus custom tuning via the companion app
  • 36 hours total playtime and 2 hours from a 10-minute charge

36-Hour Semi-In-Ear Earbuds

The Soundcore K20i by Anker are lightweight semi-in-ear wireless earbuds that deliver up to 36 hours of total playtime. They use a 13 mm dynamic driver with BassUp technology and Bluetooth 5.3 connectivity. Weighing only 3.3 g each, they sit comfortably without ear tips and suit listeners who prefer an open fit for podcasts and music.

Check Bluetooth and App Needs

Your phone or laptop must support Bluetooth 5.3 to use these earbuds. The Soundcore app is required to access the 22 preset EQ settings and the customizable EQ options. Verify that your device can install the app before ordering. The earbuds have an IPX5 rating, so confirm that level of water resistance matches your intended use.

Thermals Noise and Power Draw

The charging case provides the full 36-hour operating time and a 10-minute fast charge adds two hours of playback. Two lithium polymer batteries power the earbuds and case. Passive sound isolation reduces ambient noise during calls, while dual-microphone ENC with AI noise reduction keeps voice clarity high in busy environments.

Highlights

  • Clear sound from a 13 mm driver with BassUp technology
  • Semi-in-ear fit at 3.3 g per bud for all-day comfort
  • AI-powered dual-mic ENC keeps calls clear in noisy places
  • 22 preset EQs plus custom tuning via the companion app
  • 36 hours total playtime and 2 hours from a 10-minute charge

Specifications

BrandSoundcore
SeriesK20i
ModelK20i
Part NumberA3994
TypeEarbud
ColorBlack
Frequency Response20 Hz - 4 kHz
Input Impedance16 Ohm
Ear CouplingEarbud
Weight0.11 Pounds
Noise Cancellingsound isolation
Wireless TypeBluetooth
Battery2 Lithium Polymer batteries required
Operating Time36 hours
Charge Time10-minute
FeaturesUltra Playtime, Semi-In-Ear Comfort, Lightweight, Universal Phone Control, Water Resistant

Questions about this item

What comes in the box with the Soundcore K20i earbuds and what must I buy separately?

The package includes the earbuds and charging case; no separate purchases are required for basic operation.

Which version or capacity of the K20i should I choose?

Only one configuration exists — model A3994 in black with 36 hours total playtime.

What does the 36-hour playtime figure mean in daily use?

It represents total listening time from the earbuds and case combined; a 10-minute charge adds 2 hours.

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