2.4G Wireless AV Sender 150m transmission range 4 Selectable channels RCA port, ... . Use 2.4GHz ISM frequency band.2. 150m transmission range.3. Support 4 groups of channels. You ... sound is clear.6. Supports video transmission of PAL/NTSC system and stereo audio transmission.7. Dimensions: 10cm (L) ... wireless audio transmitter, Model:PAT-330,150M transmission distance,CE tested,Best price,good quality