[. . . ] HDE 2020-D Information Systems | Tourguide 2020-D Unique Guided Tour System General Description HDE 2020-D-US stethoset TourGuide receiver is the comfortable to wear receiver of the digital Tourguide System 2020-D. [. . . ] The stethoset receiver automatically deactivates itself the moment that it is taken off, meaning battery life will be preserved. No longer will the tourguide need to check all of the sets after one tour finishes and before the next tour starts. Your tour participants will be able to individually adjust the volume through a rotary control on the receiver, without the need to even take the device off. An LC display will clearly confirm the volume, battery status, quality of reception and the channel being listened to. The reception range is about 50 m if your tour is outdoors and about 25 m if your tour is indoors. Technical Data Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 FSK RF frequency range . . . . . . . . . . . . . . . . . . . . . . . Europe: 863 ­ 865 MHz USA: 926 ­ 928 MHz Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 ­ 7, 000 Hz Sound pressure level . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 dB SPL at 1 kHz THD at 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 1 % Typical operating time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 hrs Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] HDE 2020-D-US (minimum order quantity 10 pcs. ) Product Variants j Earbuds black for HDE 2020 D stethoset receiver (1pcs. ) j Earbuds transparent for HDE 2020 D stethoset receiver (1pcs. ) Cat. [. . . ]