HELLA 009148001 12-24 V 90 dB Back Up Alarm HELLA back up alarms guarantee best functionality, optimum fit and long lasting customer satisfaction. Original equipment quality back up alarms you can trust from a global leader in automotive technologies for more than 100 years Back up alarm comes with an integrated bracket for universal mounting and an integrated Amp plug. Sound level: 90 dB(A); Voltage: Multivoltage (12 V - 24V). Dimensions: 2.9" height x 3.9" width. Approved against electromagnetic tolerance and according to SAE.