wireless lavalier microphone,,plug and play
condenser microphone
Battery capacity: 80MAH 
charging case battery; 300MAH 
Battery life: 7-8 hours 
SNR: 64DBM 
Adaptive noise reduction Transmission delay: 30MS Sensitivity: -38DB 
frequency response range: 20-20KHZ 

transmission distance: barrier-free 20-30 meters