CTA Digital IP-AST Wireless Air Sound Transmitter CTA USB 2.4GHz Sound Port Wireless Music Transfer System General Features: Transmits Audio Signal From Satellite Radio Receivers, MP3 players, Computers, iPods to speakers and RF Frequency: 2.400 GHz ~ 2.479 GHz RF Output power: 10 dBm Min 50m transmission distance without block Audio Frequency: 20 ~ 20 kHz Audio Sampling: 44.1 kz, 16-bit, near CD quality