Tour guides are widely used in tour guides; voice teaching; business management training; church translation; simultaneous interpretation. One way audio transmission function; you only need to use your own AUX cable to connect the transmitter and some external media devices; such as church listening system; mobile phone; notebook; computer; iPad. Custom number of users; church translation system has 99 IDs; allowing up to 99 groups to work simultaneously in the same room; can be used for simultaneous interpretation in multiple languages; add up to countless receivers depending on the number and scene required. Wide working range; as long as it does not exceed 164 ft/50 m; the receivers can hear the clear voice from the transmitter; you can also adjust the volume of the receiver freely by clicking the left or right button when listening. FCC certified. FCC ID:2AAR8T130; Transmitter and receivers of the tour guide system uses a built-in rechargeable lithium battery; Which has a large battery capacity and does not need to replace a large number of dry batteries when the consumption.