Microphone condenser 4.5*2.2 mm

From the shop's description

Electret microphone is a sound- electrical conversion device. It is used in telephones, wireless telephones, mobile phones, ear-telephones, recorders, radio recorders, alarms, voice control toys, voice control switches and more Note: Check photo below to find the ground Specifications: Size: 4.5 x 2.2 mm Directivity: omnidirectional Connection: solder type Sensitivity: -28 to -58dB Standard operating voltage: 3V Impedance: 2.2K Ω