20 pcs High decibel SFM-20B type DC3-24V continuous sound signal buzzer 2312 active piezoelectriczer

brand new and high quality 95DB Piezoelectric Buzzer Alarm. Double CPU for rapid response. High quality and easy to install. The radar-system on automatically when the car engine starts. Beeping alarm prompt step bystep, the obstacle, more rapid the alarm sound. Specifications: Material: ABS Alarm Diameter:22mm/0.86" Alarm Height:10mm/0.39” 2 Mounting Holes distance:30mm/1.18" 2 Wires length:90mm/3.54" Buzzer Type: Piezoelectric Sound Pressure Level: 95 Rate Operating Current Rating 10mA Frequency: 3900±500Hz Method: Circuit Built in Mounting Holes Sound: Continuous Package Includes: 1x Buzzer Alarm Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.