10 Pcs 12mm x 9.5mm Active Buzzer Alarm Ringer DC12V 80dB
Min Sound Output at 30cm 80dB. Pitch 7.6mm/0.3". Oscillation Frequency 4000+/- 500 Hz. You can put your trust in us! 10Pcs 4x2mm 30-44dB Condenser Microphone High Sensitivity Pickup w Wire. Microphones Battery Cover Wireless Gray 2Pcs.