SF55I Electronic Buzzer Alarm 12V DC Compact Piezo Siren for Audible Alerts Reliable, easytoinstall audible alert for 12V systems. The SF55I produces a continuous beep using a piezo sounder and activates on a input signal. Its compact footprint and wired connection make it suitable for vehicle, security, and equipment alarms where a clear, attentiongrabbing tone is required. Sold as 1 piece. Key benefits Immediate audible notification: Continuous beep tone delivers a clear alert that is easy to hear in noisy environments. Simple integration: Active input and prewired leads let you connect directly to 12V DC alarm circuits or control outputs. Spaceefficient design: Compact dimensions (55 x 57.5 mm) fit into instrument panels, enclosures, or tight mounting locations. Practical and dependable: Piezo sounder provides consistent output with minimal moving parts for long service life. Plugandplay convenience: Supplied with wires for quick installation without additional adapters. What it does and how it solves problems Alerts users to events that require attention, such as security breaches, equipment faults, or process changes. Converts a 12V signal into a continuous audible alarm, removing the need for complex driver circuitry. Compact size and straightforward wiring reduce installation time and simplify retrofits into existing systems. Technical highlights Model: SF55I Voltage: 12V DC Sound type: Continuous beep Activation: Active input Transducer: Piezoelectric sounder Dimensions: 55 x 57.5 mm Package: 1 piece with connecting wire(s) Typical applications Vehicle and marine alarms: Use as a horn or warning siren for 12V cars, trucks, motorcycles, and small boats. Security systems: Add to alarm panels, door sensors, or perimeter detectors to provide immediate audible notification. Industrial and workshop equipment: Indicate machine faults, process stops, or operator alerts on 12V control systems. Installation notes Requires a 12V DC supply and a control signal that goes to a level to activate the buzzer. Follow basic electrical safety and match wiring polarity and signal characteristics to your system. Suitable for panel mounting where compact size and a direct wired connection are preferred. Package contents 1 x SF55I electronic buzzer alarm with connection wires The SF55I is a straightforward solution when you need a reliable, compact 12V audible alarm that is easy to fit into existing systems and provides a consistent continuous tone for clear alerts.