The Koss BT539i Wireless Bluetooth® Over-Ear Headphones pack powerful wireless sound into a portable, fold-flat unit. The Koss BT539i Wireless Bluetooth® headphones have the natural fitting, iconic D-profile earcup, first featured on the ergonomically designed Koss Pro4AAA and now available on many Koss headphones. The D-profile 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. Closed ear cushions fit comfortably around the ears to block outside noise and keep music from leaking out. , ,When the music stops, the Koss BT539i headphones fold flat into a convenient size that is easy to carry and even easier to store. , ,The Bluetooth® word mark is a registered trademark owned by Bluetooth SIG, Inc. and any use of such mark by Koss Corporation is under license. ,
The Original American Stereophone Company ,Ever since we invented the world’s first SP/3 stereophone back in 1958, Koss Stereophones have been bringing back the excitement of a live performance. Music lovers around the world recognize that dedication to accuracy in sound reproduction as The Sound of Koss. , ,THE SOUND OF KOSS ,High-Resolution dynamic audio driver , ,CUT THE CORD ,Bluetooth® 4.0 Wireless Freedom , ,STAY CONNECTED ,Built in microphone & on-board controls , ,Wireless Bluetooth® Over-Ear Headphones , ,KEY FEATURES: ,Full size, Wireless Bluetooth® Over-Ear Headphones ,Bluetooth® 4.0 Technology ,D-Profile ,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 ,Specifications ,10-20,000 Hz ,38 Ohms ,97 dB SPL ,4 foot ,1 Year Warranty
