HJ-3840 Piezoelectric Transducer:

Crystal Dimension (mm)   Ø38xØ15x5               Static  Capacitance (Pf)     4000

Diameter x Height (mm)   Φ48x 50                   Resonant Frequency (KHZ)  40±0.5

Screw Dimension              M10x 1.5                    Width:                       (kHZ)  3.40

Impedance            (Ω)       ≤25                          Insulated Impedance ( Ω )  ≥100M

Power                    (w)         60