Califone International CLS747-4 Wireless Headphones

Califone CLS747-4 Wireless headphone system technology puts a premium on wireless learning. Califone's monaural learning system allows an infinite number of headphones to meet the specialized needs of group instruction. Students can learn language, improve math, reading and speaking skills at differentiated learning rates. Just plug any multimedia source into the VHF/FM transmitter, turn on the headphones and you're wireless! Features: -Rechargeable wireless headphones (6 hr battery life per charge) -Volume control built into each heaphone -Rugged ABS plastic ear cups that reduce ambient noise -Differing signals allows four separate groups to listen at the same time in the same room without any interference -Mic input on the transmitter allows the instructor to communicate directly with students, covering at least 100' -Optional headphone rack sold separately -One year warranty with school use COLOR CODE: -Yellow - frequency: 72.100 MHz -Red - frequency: 74.700 MHz -Green - frequency: 72.900 MHz Please note t