Functional.The beepers works great as a replacement piezo speaker to an old KMC alarm clock.Used these to extend an alarm to all levels of the house.As a replacement for a failed piezo motorcycle horn.Used these beepers for turn signal alarms on a motorcycle.Works well for malfunction warning on small equipment.Use them as temp and oil pressure alarms on the boat.
The plastic shell made of high-quality ABS material is environmentally friendly,flame-retardant,anti-aging,wear-resistant,strong and durable.The upper and lower shells are all high-temperature shells,and the circuit boards,PIN pins and welding wires are all lead-free materials. Working voltage:3-24 V DC
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Specification: Descriptions: ABS external material, DC 3-24V working voltage, wireless, 2 mounting (screw terminals). Decibel: 85DB, continuous sound beep An ideal item for machinery equiment, oven, electric cabinet, industrial using, etc..