Wireless Ultrasound Vibration Sensor, Resonant frequency: 37 [kHz] ±1 [kHz], Range/Resolution: 20-100 / 0.5 [dBµVRMS], 2 Mile Signal (LOS), IP65 + Hazardous Locations Certified (UL 121201 9th Edition, Cl. 1, Div. 2), Uses 6xAA Batteries (Not Included).
