K 840 KL headphones use advanced Kleer® wireless technology to stream lossless, CD-quality audio over the air from your iPod, iPhone or other portable music player.
Unlike wireless technologies that degrade the sound, the Kleer system delivers pure, uncompressed 16-bit stereo audio over a robust 2.4GHz radio link, so you’ll hear much more of your music with much less interference.
And with an operating range of more than 20m and battery life of up to two weeks in normal use, the K 840 KLs go farther and play longer than any of their wireless competitors.
Uncompressed sound quality
Extended battery life (up to 2 weeks)
Extended operating range (up to 20m/65.6 ft)
3D-Axis2 folding headband
Ear-cup volume control
Passive noise reduction
Hard case and charger included
3D-Axis² (folding mechanism) Yes
Color black / aluminium
Headphones weight without cable (g) 145
Sensitivity (dB/mW, dB/V*) 120 (wired)
Audio bandwidth (Hz to kHz) 10,5-31
Max. input power (mW) 25
Rated impedance (ohms) 32
Convertible jack plug (1/8Ó to 1/4Ó) Yes
Convertible jack plug (1/4Ó to 1/8Ó)
Replaceable ear pads Yes
Hard gold-plated jack plug and contacts Yes
Hard gold-plated jack plug and contacts rosegold
NdFe magnets Yes
Suited for (SA)CD, DVD(A), DAT Yes
Best for MP3, CD, MD and PC/laptops Yes
Battery life (hours) headphones/transmitter 28 hrs.