Koss BT539i Bluetooth Headphonessearch

Koss BT539i Bluetooth Headphones

Koss BT539i Bluetooth Headphones

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Wireless Freedom, Collapsible Design

A great travel companion for those who prefer full-size, over-ear headphones, the Koss BT539i boasts Bluetooth 4.0 functionality and a design that folds flat for easy storage. On one of the D-shaped ear cups, you’ll find the built-in microphone and onboard controls. Navigate quickly through songs, play or pause music, change the volume level, and answer incoming calls with the press of a button. The rechargeable lithium-ion battery gives you up to 12 hours of playback or call time at moderate levels (or 40 hours of standby time) on a single charge. If the battery runs low, switch to wired operation using the included 3.5-millimeter cable. 

Note: At checkout, choose gray or white.

The Reviews Are In

Major HiFi  reviewer Steven Newcastle says, "The sound of the Koss BT539iw is quite impressive considering this is on the low end of Bluetooth headphones for this price range (under $100). I was able to drive the volume up without significant distortion. The bass frequencies were good, even better than expected."

About Koss

If we were to write a history of audio companies in the US, Koss would land on the first page. Not only did the Milwaukee, Wisconsin–based company make the world’s first stereo headphone, the SP/3, in 1958, it’s also responsible for the first self-energizing electrostatic headphone, the first dynamic headphone to deliver all 10 audible octaves, and a standard-setting infrared wireless headphone. Over the years, Koss headphones have made it onto Air Force One, into the Smithsonian, and onto the heads of such music icons as Neil Diamond, Tony Bennett, and Pete Fountain. Founder John C. Koss was inducted into the Audio Hall of Fame in 1979 and the Consumer Electronics Hall of Fame in 2000.


  • Koss
  • Design: Over-ear, folds flat
  • Driver type: Dynamic
  • Bluetooth version: 4.0
  • Frequency response: 10 Hz–20 kHz
  • Impedance: 38 ohms
  • Sensitivity: 97 dB SPL
  • Onboard mic and controls
  • Battery: Built-in rechargeable lithium-ion
  • Playback time: 12 hrs at moderate volume
  • Standby time: 40 hrs
  • Cable: 4 ft (1.2 m), detachable


  • ⅛ in (3.5 mm) cable
  • USB Cable


All orders will be shipped by Massdrop.

Estimated ship date is Dec 19, 2018 PT.

After the drop ends, payment will be collected and the group’s order will be submitted to the vendor up front, making all sales final. Check the discussion page for updates on your order.