KEY FEATURES 2s auto pairing, plug and play Ultra-compact wireless audio 2.4GHz digital transmission, crystal-clear audio at up to 164ft, optimised for extremely stable operation in dense RF environments Built-in Omni mics and external lavalier microphone, meet the needs of different scenarios Fine mic adjustment for easier audio post editing Professional audio chip for clear and natural sound Most important: It is the first one to pass the FCC test in the market. Enjoy your buy, you will NEVER regret it.