wireless lavalier microphone，
selp-charging warehouse type
one-to-one or one-to-two or one-to-four
*.digital dispay screen
*.2.4G wireless technology
*.reverberation effect
*.double noise reduction
*.charging chamber
*.omnidirectional radio
*.HD sound quality
*.barrier-free transmission ≥20 meters 
*.battery life 4-6 hour
*.powerful and compatible
*.frequency range 20-20KHz
*.signal to noise ratio ≥64DBM
*.strong compatibility
*.charging compartment capacity 600mAh
*.microphone battery capacity 60mAh