Active buzzer can be operated with AC220V, sound type: steady sound, no need to drive, it makes a sound when switched on Audio Tips: Multivibrator consists of transistors or integrated circuits, when switched on, the multivibrator vibrates and emits audio signal, SPL: 85 to 95 decibels The electronic alarm buzzer consists mainly of a multivibrator, a piezoelectric buzzer chip, an impedance adjustment unit, a resonator and a housing. Made of high quality ABS material, environmentally friendly, flame retardant and durable Application: Widely used in car modification, DIY project for electronic reminder or other areas that require an acoustic alarm Note: When power-related maintenance and installation, make sure the operator is qualified for electrical work and takes the necessary shut-off and insulation protection measures Electronic alarm buzzer. 1. It has the characteristics of continuous beeping, small size, low loss, high voice pressure, etc. 2. Plastic shell, AC 220 V working voltage. 3. Quick Operation: the black active electronic buzzer can be easily controlled. When the rated power is connected, the buzzer will sound continuously. The buzzer of the application emits more beeps to prompt the user to perform the process. 4. Application:Circuit buzzers are widely used as sound transmitter in electronic products such as computers, printers, copiers, alarm systems, electronic toys, electronic vehicles, phones, timers, etc. 5. Specifications: Diameter: 30mm/1.2 inch Sound pressure decibel: 90/85Bd .Sound type: orchid grass music 6. Packaging: 2 x electronic alarm buzzer Electronic alarm buzzer. 1. It has the characteristics of continuous beeping, small size, low loss, high voice pressure, etc. 2. Plastic shell, AC 220 V working voltage. 3. Quick Operation: the black active electronic buzzer can be easily controlled. When the rated power is connected, the buzzer will sound continuously. The buzzer of the application emits more beeps to prompt the user to perform the process. 4. Application:Circuit buzzers are widely used as sound transmitter in electronic products such as computers, printers, copiers, alarm systems, electronic toys, electronic vehicles, phones, timers, etc. 5. Specifications: Diameter: 30mm/1.2 inch Sound pressure decibel: 90/85Bd .Sound type: orchid grass music 6. Packaging: 2 x electronic alarm buzzer