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Black in-ear earphones with inline microphone and 3.5 mm plug

HiFiMAN

HiFiMAN RE400a In-Ear Earphones Android Black

SKU CH-D6D0-7HD98

In-ear headphones with 8.5 mm titanium-coated drivers, 15 Hz–22 kHz response, inline Android controls and a 6.700 m cable

  • TypeIn-Ear
  • ColorBlack
  • Frequency Response15Hz~22 KHZ
  • Input Impedance32 ohms
  • ConnectorYes
  • Ear CouplingEarbud
  • Wide frequency range from 15 Hz to 22 kHz for detailed sound
  • Titanium-coated 8.5 mm drivers with neodymium magnets for accurate reproduction
  • Oxygen-free copper cable reduces signal loss
  • In-line control and microphone designed for Android devices
  • Lightweight 15.8 g build with ergonomic fit for long sessions

Designed for Android listeners

The RE400a is an in-ear headphone built specifically for Android devices. It uses a 3.5 mm mini plug and includes an in-line control module for calls and playback. Titanium-coated 8.5 mm drivers with neodymium magnets deliver a frequency response of 15 Hz to 22 kHz. The package suits commuters and office workers who want a lightweight wired option.

Capacity and headroom

The 32 ohm impedance and 102 dB sensitivity make the earphones easy to drive from a smartphone without an external amplifier. Rated power is 10 mW with a maximum of 30 mW, providing comfortable volume for podcasts and music. They are not suited for professional monitoring setups that demand higher power handling or balanced connections. Bass extension stops at 15 Hz, so sub-bass enthusiasts may find the low end limited.

Build quality and daily use

Oxygen-free copper cabling runs 6.700 units in length, giving enough slack for pocket-to-ear routing without excess coil. The housings weigh only 15.8 g, reducing fatigue during extended listening sessions. Ergonomic earbud tips create a secure seal for passive isolation on public transport. The straight 3.5 mm plug fits most phone cases, though users with recessed jacks may need an adapter.

Highlights

  • Wide frequency range from 15 Hz to 22 kHz for detailed sound
  • Titanium-coated 8.5 mm drivers with neodymium magnets for accurate reproduction
  • Oxygen-free copper cable reduces signal loss
  • In-line control and microphone designed for Android devices
  • Lightweight 15.8 g build with ergonomic fit for long sessions

Specifications

BrandHiFiMAN
ModelRE400a
TypeIn-Ear
ColorBlack
Frequency Response15Hz~22 KHZ
Input Impedance32 ohms
ConnectorYes
Ear CouplingEarbud
Cord Length6.700
Microphone Sensitivity102dB

Questions about this item

Will the 3.5 mm plug on the RE400a work with my older phone that has a standard headphone jack?

Yes, the 3.5 mm mini plug connects to any standard headphone jack on older phones, laptops or portable players.

How can I confirm the earphones are performing correctly after I plug them in?

Play a track with deep bass and high treble; you should hear response down to 15 Hz and up to 22 kHz with the 8.5 mm titanium-coated drivers.

What comes in the box and do I need to buy any cables separately?

The RE400a earphones with 6.700 m oxygen-free copper cable, 3.5 mm plug and in-line Android control are included; no extra cable is required.

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