ITEM NAME:5Pcs New Audio Tweeters Round Piezoelectric Tweeter Speaker Buzzer DIY Description: 51mm Waterproof Piezoelectric Ultrasonic Speaker. Rated Noise Power: 5.5Vp-p. Rated Long Power(Max): 30Vp-p. Rated Frequency: 2.5-60KHz. Can be used in repellers, bird repellers, dog training devices, etc. Specification: Poduct: Piezoelectric Ultrasonic Speaker Material: ABS Rated Noise Power: 5.5Vp-p Rated Long Power(Max): 30Vp-p Rated Frequency: 2.5-60KHz Operating Frequency: 20 ±5KHz Rated Sensitivity: ≠¥100dB Operating Temperature: -20℃~60℃ Storage Temperature: -30℃~70℃ Diameter: 51mm/2.01inch Height: 20mm/0.79inch Package Includes: 5 Pieces Piezoelectric Ultrasonic Speaker KTT0002459719490936.51mm Waterproof Piezoelectric Ultrasonic Speaker. Poduct: Piezoelectric Ultrasonic Speaker. 5 Pieces Piezoelectric Ultrasonic Speaker. Rated Noise Power: 5.5Vp-p. Storage Temperature: -30℃~70℃. Rated Sensitivity: ≠¥100dB.