Mini 4pin PC Motherboard Buzzer Speaker for BIOS Beep and Alarm A compact, easy to install motherboard buzzer that provides clear audible BIOS beeps and alarm signals during system power up and troubleshooting. Designed for systems that lack an onboard speaker, this mini buzzer connects to a standard 4pin speaker header to deliver reliable POST and error code alerts. Key benefits Quick fault detection: Hear BIOS POST beeps and error codes to identify hardware issues without needing a display. Simple installation: Prewired 4pin connector plugs directly into the motherboard speaker header for immediate use. Space saving design: Miniature form factor fits inside most PC and small form factor cases without obstructing other components. Reliable construction: Durable plastic housing and secure connector ensure consistent performance over repeated use. Main features Function: Produces standard BIOS beep tones and alarm sounds used for POST and error signaling. Compatibility: Compatible with motherboards that provide a 4pin speaker or PC speaker header labeled speaker, spk, or similar. Check the motherboard manual for header location and pin arrangement. Size and fit: Compact, lightweight unit suitable for full size and small form factor cases. Materials and durability: Plastic housing with preattached cable and 4pin connector for a secure electrical connection. Performance: Delivers clear, audible beeps for system start, POST status, and error codes to assist with diagnostics. Practical use scenarios build verification: Install the buzzer when assembling a PC to confirm successful POST before installing an operating system. Troubleshooting a nonbooting system: Use beep codes to narrow down faulty components such as memory, CPU, or graphics card without needing a monitor. Motherboard testing on a bench: Quickly confirm motherboard POST behavior during diagnostic tests or component swaps. Installation tips Locate the motherboard speaker header and align the 4pin connector according to the manual. If unsure of pin orientation or header labeling, consult the motherboard documentation before connecting. Position the buzzer inside the case where it can be heard clearly, avoiding contact with moving parts. This mini 4pin motherboard buzzer provides a nofrills, dependable way to get audible BIOS feedback during builds, maintenance, and troubleshooting.