Wirless headphone,transmeter distance can be 30 meters. it should be more convenience for your work.

Wireless Headphone

TRANSMITTERWorking Frequency:85.5±0.2MHzPower supply:DC 4.5VTransmitting Distance:30 MeterOperatingCurrent:≤30 mARECEIVER Working Frequency:84.5MHz-106.5MHzPower supply:DC 3VOperatingCurrent:≤20 mA

Wireless Headphone 5E-WIR006