6 Pcs Active Piezo Electric Buzzer Alarm, DC 3-24V Low Voltage Buzzer Beep Tone Speaker Alarm with Lead Wire for Classroom, Game Show, Physics Circuits Intermittent Sound

Chnee 6 Pcs Active Piezo Electric Buzzer Alarm, DC 3-24V Low Voltage Buzzer Beep Tone Speaker Alarm with Lead Wire for Classroom, Game Show, Physics Circuits Intermittent Sound

AmazonBasics 9 Volt Everyday Alkaline Batteries - Pack of 8

VWEICYY 9V Battery Connector,10 PCS T-Type 9 Volt Battery Buckle Connector Hard Buckle Plastic Shell Used in Student Experiment,or Other Equipment with 9V Battery(T-Type, 10)