[. . . ] SK 2020-D Information Systems | Tourguide 2020-D Unique Guided Tour System General Description The TourGuide transmitter SK 2020-D will allow you to deliver a highly professional guided tour. [. . . ] The transmitter can be easily and comfortably operated, and is highly robust. The back-lit display confirms channel choice, the radio signal and the status of the battery. For example, you will be able to transmit an external audio source such as music from a portable CD player via your transmitter and continue to talk or mute the microphone. Technical Data Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 FSK RF frequency range . . . . . . . . . . . . . . . . . . . . . . . Europe: 863 ­ 865 MHz USA: 926 ­ 928 MHz Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 ­ 7, 000 Hz Max. mic/line input voltage. . . . . . . . . microphone: 650 mVrms, line: 2 Vrms Operating time (Accupack) . . . . . . . . . . . . . . . . . . . . . . . 10 h (BA 2015) Power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . BA 2015 / 2, 4V; 2x AA 1, 5V Operating temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 500548 Features j 6 channels in the license-free frequency range Europe: 863 ­ 865 MHz j Microphone input (3. 5 mm screw-type jack socket) with adjustable sensitivity j Line input (3. 5 mm screw-type jack socket) with adjustable sensitivity j Backlit display shows: j Channel selection j Battery status j Audio level meter for microphone j Audio level meter for line input j Lock mode j Yellow LED: peak warning j Red LED: MUTE or LOW BATT warning j Delivery includes:1 pcs. [. . . ]