The Sony MDR-IF240RK is a low-cost Infrared wireless headphone system, designed for the home enjoyment monitoring of, and simple connection, to televisions, stereo tuners, and CD or minidisc components. The transmitter also functions as a battery charger, with an LED charging status indicator light, and the automatic headphone shutoff helps conserve battery life when the headphones are secured in the transmitter cradle.
The MDR-IF240RK NiMH battery powered headphones feature volume control, a mute function protecting the drivers from noise when no audio signal is present, and a self-adjusting headband for listening comfort. The headphones are equipped with 30mm drivers and PET low-mass diaphragms, for extended low and high end frequency reproduction. The system allows mobility within a transmission range of 24 feet.