Microphone condenser 4*1.5 mm 4mm to 8mm same look and work with

same look and work with the existing shields but can adapt to new shields

So please use it with confidence

User can convert the change of conductivity to correspond output change voltage  of gas concentration through a simple circuit

Rated input voltage:  100~240 Vac

Microphone condenser 4*1.5 mm 4mm to 8mm same look and work withElectric 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 Specifications: Size: 4 x 1. 5 mm Directive: unidirectional Connection: solder type Sensitivity: 28 to 58dB Standard operating voltage: 3V Impedance: 2. 2K