The HCT9040B is an external-driven, surface-mount (SMD) magnetic buzzer manufactured by Kaili Electronic Factory.,
Type: SMD magnetic buzzer (surface mount)Drive Type: External-drivenDimensions: 10.5 mm × 9 mm × 4 mm (Height)Operating Voltage: 3V p-pResonant Frequency: 2.7 kHzSound Output: 85 dB,