10 piece set of active magnetic buzzers for clear continuous alert tones. Each unit is an active buzzer that emits a long continuous beep when powered, designed for compact electronic applications and case alerts. Key benefits Ready to use active buzzers that produce a strong continuous tone without additional driver circuitry. Multi voltage options for different system requirements: supports 3V, 5V, and 12V operation. Model references included TMB12A03, TMB12A05, TMB12A12 and 16R notation. Compact 12 x 9.5 mm footprint fits tight spaces and common mounting points in small enclosures. Magnetic element provides consistent tone generation suitable for alerts, notifications, and diagnostics. Pack of 10 units for repairs, small production runs, prototyping, or spares. What makes this product practical Function: Active buzzer produces sound when DC voltage is applied, no external oscillation circuit required. Compatibility: Works with power supplies, microcontroller development boards, control panels, alarm circuits, and computer case headers. Size and form factor: Mini plug speaker style with a 12 x 9.5 mm housing for easy replacement of common chassis buzzers. Performance: Designed for stable long continuous beep tone suited to status alerts and alarms. Typical applications Computer case or chassis alert replacement to restore power on and error beep signals. Electronics projects and prototyping where a simple audible indicator is needed without extra components. Control panels or small equipment requiring a compact alert device for fault or status notification. What you get Ten active magnetic buzzers in mini plug speaker form factor. Color listed as computer case buzzer. Models referenced TMB12A03, TMB12A05, TMB12A12. Size 12 x 9.5 mm. Simple to install, compatible with common voltage levels, and suited for multiple small scale applications where a reliable continuous beep is required.