Green Lion Wireless Microphone With Remote Control Lightning -1000mAh Charging Case Battery Capacity -20Hz-20Khz Frequency Response Range -180mAh Microphone Battery Capacity -Frequency: 2.4GHz Digital Frequency -30dB + 3dB Sensitivity -30dB +3dB -Environment Noise Cancellation -Operating Range: Up To 50 Mtr -2.4GHz Digital Transmission -Real-Time Monitoring -7Hr Working Time -Remote Control -Digital Display -360 Pick Up