Improved Wireless Microphone for Phones

Color: Black Receiver battery capacity: 220mAh Microphone endurance: 8 hours Box size: about 9.3*3*12.7cm Product size: about 8*2*1.5cm Receiver connector: 3.5mm diameter Microphone: digital silicon microphone Bluetooth version: 5.0 Input voltage: 5V Signal to noise ratio: ≥60dB Frequency response: 20HZ-20KHZ Transmission distance: 20 meters