Model 253 is a unique back-up alarm that samples the ambient noise levels surrounding the vehicle and adjusts its sound output automatically.
By “listening" to the surrounding sound levels, Model 253 will continuously adjust the output to provide 10 dBa (±4) over ambient noise levels.
This self-adjusting vehicular alarm provides just the right level of audible signal required to warn employees of an approaching fork lift or tow motor.
This solid state device operates on 12-48VDC vehicle system voltage. Model 253 emits sound at 80 pulses per minute. It is polarity protected and will not operate when incorrectly wired.


Voltage 12-48VDC
Operating Current 0.25 Amps
Operating Temperature Minimum -40 °F
Operating Temperature Maximum 185 °F
Decibel Output 82 to 107 at 4 Feet
91 to 120 at 1 Meter
Enclosure Rating Type 4X
Height 3.060 in
Width 5.000 in
Depth 3.780 in
Net Weight 1.44 lb
Shipping Weight 1.54 lb


Product Literature
Product Manuals

Ordering Information

Model Types
Model Description UPC
253-012-048 Back-up alarm, self adjusting volume, 12-48VDC 782979200239