Beijing kuaiyu Co.Ltd is one of the well-known suppliers of security & protection products in China; we are specialized in Audio surveillance & Monitoring kits. Our Tradio brand series products represent the most advanced technology in China for five years, We are respected by users around the world for an excellent sound experience with low echo & noise.Theses kits are widely used in: Convenience stores Sleep disorder centers Police interrogation rooms Booking rooms Fast food restaurants Speech Therapy labs Casino soft count rooms Cashier booths Anywhere CCTV cameras are installed