K 840 KL headphones use advanced Kleer® wireless technology to stream lossless audio over the air from your iPod, iPhone or other portable music players. The Kleer® system delivers pure, uncompressed 16-bit stereo audio over a robust 2.4 GHz radio link. You’ll hear much more of your music with much less interference. With an operating range of more than 20 m and battery life of up to two weeks in normal use, the K 840 KL goes farther and plays longer than any of its wireless competitors. The design of the headphone comes from the design agency SIGNCE and the design of the accessories from Designit.