One-touch automatic channel synchronization; tour guide audio system offers one-touch pairing; enabling multiple receivers to be paired with a transmitter in a short period of time; this saves valuable time. 200m/656ft working distance; TT116 tour guide system provides wide coverage during museum tours or outdoor excursions; ensuring clear communication between the guide and participants; visitors are free to move around and listen to the narration; even if they are dispersed or exploring different areas. User-friendly design; TT116 transmitter with back clip that allows the speaker to hang it on a belt or pocket to free up their hands; the D-shaped headset included with the receiver is not only comfortable and firm to wear but it can be worn in both the left and right ear. 50 channel IDs; TT116 wireless tour guide audio system provide 50 channel IDs; church translation system for factory tours can accommodate multiple tours or groups within the same factory without any interference between the 50 groups. Crystal clear sound; tour guide system filters out background noise; ensuring that the audio transmitted to the listener is clear and easy to understand; low noise floor; relieves damage to ears caused by long-term use; and the maximum volume boost can adjust the appropriate volume.