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12VDC Electronic Buzzer Alarm, 85 to 95 decibels Active Piezo Electronic Buzzer Alarm Continuous Sound Cable Length 100m Mainly consists of multivibrator, piezoelectric buzzer chip, impedance matching unit, resonator and housingGeneric 
Freezer Door Alarm – Fridge Alert Buzzer, Refrigerator Entry Chime| Voice Operated Alert Motion Triggered Warning, Autom Wide Applicability: Prevent energy waste and safety risks with smart reminders, versatile for air conditioners, safes, rHoneTeek 
Motion Sensor Detector Door Chime for Business Store Entry Alert, Welcome Buzzer Monitor Doorbell Alarm for Home Elderly ✨【Welcome Buzzer Monitor】The owners can use the doorbell to be alerted when people enter or leave. Use it to detect visiBest Value Actpe 
Motion Sensor Doorbell for Business Entry, Store Welcome Buzzer Monitor, Outdoor Door Chime Kit: Infrared Motion Sensor ❤️ 【Easy, Fast, Wire Free Installation】 Infrared sensor detects motion and sends a signal to the receiver. Chose from 36Denash 
Warning Buzzer, Piezo Buzzer Buzzer Chip Conveniently Controlled Integration Structure Copier Computer Resonator and She Multivibrator vibrates and outputs audioHealeved 
Healeved 6pcs Piezo Electronic Buzzer Security Alarm Door Chime Buzzer for Home Use Electric buzzer: inside is a piezo plus the driver circuitry and electric components.ERINGOGO 
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