Piezo Ceramic Ring with Silver electrodes on both sides, main application is for Ultrasonic welding.

The piezoelectric ceramic sensor is used for ultrasonic beauty film with a diameter of 16mm, a resonance frequency of Fs 5±7%MHz, and a material of 0.41mm thickness. PZT4 has two electrodes on one side.

This piezo speaker is an ultrasonic transmitter rat repellent. The ultrasonic wave (over 20khz) can effectively stimulate and cause rats to feel threatened and uneasy and force them to migrate automatically. Piezo ultrasonic speaker repellent repels mosquitoes, spiders, rats, cockroaches, bats, etc.