Sennheiser Direct Ear Set 250 $229.95 Description: Excellent sound quality Easy to install Comfortable, lightweight receiver, 1.6 oz Large diameter volume control with on/off switch Right/left balance control Low frequency modification capability Environmentally sensitive, rechargeable nickel-metal hydride batteries Charging ports in transmitter for receiver and spare battery Replaceable ear cushions 2.3 MHz carrier frequency provides superior transmission reliability and prohibits interference from energy efficient lighting, radio frequencies, cordless and mobile phones and other IR transmission systems operating at 95/250 kHz Radiating power for rooms up to 645 sq. ft. 2-year warranty