BACK-UP ALARM WHITE NOISE. Designed for California vehicles PULSING "PSSS - PSSS" sound. 12-24-volts 97 Db 10-24 VDC/ 97 Decibels The latest in back-up alarm technology Produces a white nose warning sound [PSSS-PSSS] Heavy-duty commercial grade Withstands all weather conditions MODEL NO - BA-197WN