two-way :

intercom communication referee full-duplex tour guide Portable PAs Vlogger SoundField GPS triggered DSLR Interpretation Wireless Audioguides

VIP tour

miniGuide is a trouble-free tour guide system that suitable for small conference and group ...

OKAYO WT-350 series is a small and lightweight with size only 2 x 6 x 9 cm, and weight onl ...

Great sound quality combining your visual experience during the visiting!
As a result of sp ...