Hey, this is Ameerah Mason from UK. I am a scientist. Recently, I have researched on radio communication. There are two main formats for two-way radio communication systems; one is Ultra High Frequency (UHF) radio and second is Very High Frequency (VHF) radio. Both formats are efficient ways for communication with their own benefits and disadvantages. Apart from that, you can find a lot of accessories for these radio systems such as handheld two way radio, handheld speakers, ear bud receivers and Two Way Radios With Headsets.