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The Koss BT539i Wireless Bluetooth® Over-Ear Headphones pack powerful wireless sound into a portable, fold-flat unit. It uses Bluetooth® 4.0 technology to enable you to connect to your audio source wirelessly. The headphones have the natural fitting, iconic “D-profile” earcup, which mimics the shape of the ear, creating an excellent seal for the most consistent sound reproduction.

Listeners stay connected using the built-in microphone. Easy to locate, on-board controls allow listeners to quickly navigate through songs, play or pause music, change the volume level, and answer incoming calls. The built-in rechargeable lithium-ion battery delivers up to 12 hours of play time or 12 hours of call time (at moderate levels) and 40 hours of standby time on a single charge. If the rechargeable battery runs out, the BT539i comes with a detachable analog cord, which can be used as an audio bypass.
The BT539i headphones can be folded flat into a convenient size that is easy to carry and even easier to store.

Full size, Wireless Bluetooth® Over-Ear Headphones
Bluetooth® 4.0 Technology
Built-in rechargeable lithium-ion battery
Up to 12 hours of playtime (at moderate volume) on one charge
Up to 40 hours of standby time on one charge
Detachable cord
Fold flat for travel
Available in dark grey or white
Free hard shell case