Unique-Bargains DC 5V 85dB Industrial Black Active Electronic Buzzer 7pcs control sensor

Purpose and audience

This pack contains seven DC 5 V active electronic buzzers rated at 85 dB at 10 cm. They suit hobbyists, students or technicians adding audible alerts to microcontroller projects, alarm panels or simple automation tasks. Each unit draws 30 mA or less at 5 VDC. The black plastic housing measures 12 mm diameter by 10 mm height with a 7 mm terminal pitch.

Build integration

Two through-hole pins allow direct soldering to perfboard or PCB without extra driver circuitry. The 5 V logic level matches common Arduino, ESP or Raspberry Pi GPIO outputs. Operating range spans -20 °C to +70 °C, so the buzzers work inside enclosures that see wide temperature swings. Their compact footprint leaves room for other components on crowded boards.

Thermals noise and power

Current consumption stays at or below 30 mA, imposing minimal load on a 5 V supply. The active design generates a continuous tone at 85 dB measured at 10 cm, so no external frequency source is needed. Self-heating is negligible during normal intermittent use. No moving parts or fans mean silent operation when the signal is off.