Looking for a Tour Guide System. It must be hand handled, portable, size must be 75* 58 *12MM, frequency needed is 2.4GHz. ABS Plastic material made. Black Color with 18g weight, distance 100-250M and Lithium battery facility.I am a distributor of simultaneous translation equipment in Brazil. Can you tell me the frequencies, distance and number of channels and price? Is the quality of audio perfect? How can I order the sample transmitter and receiver to conduct tests?Thanks Show More