Deep-deal Takstar Monitor Hi-fi Headphone Hi 2050 for Gaming Music MID Computer Cd for Apple Ipad 2 Ipad 3 Iphone 4/4s Google Nexus Surface Music MID Computer Cd Laptop Tablet. Wireless tour guiding,simultaneous translation, audio-visual eduation Carrier Frequency:650-680MHZ UHF frequency range with 6 selectable channels One transmitter can be operated with multiple receivers within the operating range