The sound quality of the explanation is good; the sound reproduction is high; stable signal transmission can be used normally in any country. The volume is adjustable from 0-10 levels; you can adjust the volume according to your own needs; church translation system can also work normally in a noisy environment. Stable transmission distance; wireless audio transmission system has a transmission distance of 492ft; 36 channels; and clear voices can be heard within the specified range. Translation system charges for 3h; use for a dozen hours; and comes with a USB cable (type-c plug); your guests won't miss any of your messages. The wireless tour guide system is equipped with ear-hook headphones; it is hygienic and convenient; and the ear will not hurt after wearing it for a long time; tip; this system does not automatically translate; and requires manual translation.