Sony Wireless Headphones: TMR-RF850R MDR-and RF840RK.
http://pmitev.blogspot.com/2009/07/sony-cordless-headphones-tmr-rf850r-and.htmlThe most annoying problem with the older set (TMR-RF850R) is the sudden white noise when the input signal disappears and transmitter automatically turns off – the danger had passed my head!
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