XHD SFB55 Active Piezo Buzzer Kit 2 Pieces Compact, decibel audible alarms for alarm, warning, and security use. Each kit contains two XHD SFB55 active piezo buzzers that provide a continuous, attention‑getting signal across multiple supply voltages. Key benefits Loud, reliable alerting: Active piezo design delivers a decibel continuous tone that is easy to hear in noisy environments. Multivoltage compatibility: Works with DC612V systems, 24V systems, and 220V systems, making it suitable for a wide range of alarm and equipment configurations. Simple integration: Active buzzer requires only a supply voltage to operate, so it can be added to existing alarm panels, control circuits, and security setups without extra drivers. Continuous sounder function: Provides a steady alarm output for antitheft, tamper, and continuous warning applications where sustained attention is required. Pack of two: Supplied as a pair for use in multiple locations or redundant coverage. Specifications Model: XHD SFB55 Quantity: 2 pieces Type: Active piezo buzzer, electronic beep buzzer Sound mode: Continuous sounder horn Voltage compatibility: DC612V, 24V, 220V Primary use: decibel alarm and antitheft device Practical applications Security and antitheft systems: Add a clear, continuous audible alarm to door, window, or motion sensor panels to deter intrusion and alert occupants. Industrial warning and equipment alerts: Use on control panels, machinery, and fault circuits to indicate malfunctions or operating warnings where a sustained tone is needed. Vehicle and utility alarms: Suitable for 12V vehicle systems and 24V equipment, as well as 220V installations where an externally driven alert is required. Why choose the XHD SFB55 The XHD SFB55 is an active piezo solution that focuses on straightforward performance and broad compatibility. If you need a dependable, continuous audible alarm that can be integrated into different voltage systems and used across security, industrial, and utility applications, this twopiece set delivers a practical, readytoinstall option.