ZHIQIN5 Pcs Electronic Buzzer Alarm Active Piezo Buzzer Buzzer Alarm Sounder High Decibel Continuous Sound Beep 9V Battery Clip Connector Kit

5 Pcs Electronic Buzzer Alarm Active Piezo Buzzer Buzzer Alarm Sounder High Decibel Continuous Sound Beep 9V Battery Clip Connector Kit

Amazon Basics 4-Pack 9V Alkaline Batteries, 9V/6LR61, 5-Year Shelf Life - for Smoke/CO Detector, Electronics & Audio