Yesido Kr14 Dual Wireless Lavalier Microphone With Lightning Receiver

Microphone Type: Digital silicon microphone Antenna Type: Ceramic antenna Transmission Frequency: 2.4GHz Frequency Response Range: 20Hz–20KHz Transmission Delay: 20ms Microphone Battery Capacity: 70mAh Charging Time: Approximately 80 minutes Working Hours: Up to 7 hours Transmission Distance: Up to 20 meters (barrier-free) Receiver Battery Capacity: 230mAh