This is a TEVION MD81241 Wireless image and sound transmission. The set is like new but I have said used. Technical data-Operating frequency 2.4 GHz Number of channels 4-sterio sound- Range up to 100m (IN OPEN SPACE) -FUNCTIONS FM Modulation (audio-video) The set includes receiver-transmitter-power supply 2 pieces Connection cables devices-packaging instructions in german and czech. Brought as a joblot of items so do not know how to work item. Please see all photos and now what you are buying before purchase as I am unable to give any more information about this item. Fully tested so in full working order. Postage is based on weight of box.