Cordless Lapel microphones for riding arena

by Malika Coston
(Stevensville, Montana)

I am looking for a good quality cordless lapel microphone with receiver, speakers, battery/electric combo that will have a frequency up to 180'-200'. Nice if it could be compact for plane travel. I am a horse riding instructor and teach in large, dusty outdoor arenas, so its got to be tough and have good clear frequency! Please let me know of a good brand and model. Thank you! Malika Coston