Universal Backup Warning Alarms for Fleet and Heavy Trucks

At VSM we are excited to offer two all-new heavy-duty safety products designed to alert pedestrians and other nearby drivers that a vehicle or piece of heavy equipment is in reverse motion. Available for immediate shipment, universal backup alarm part numbers VSM322 and VSM326 are discrete devices with simple two-wire connections that power on automatically and output a loud tone when a driver shifts their vehicle into reverse, or manually through the use of an On/Off toggle switch, to get the attention of anyone nearby.

Part Numbers and Features

Image of VSM 322 Universal Vehicle Reversing Backup Alarm

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Part Number: VSM322


  • 97 dB, digital circuitry
  • 10-48 Volt operation
  • Polarity, voltage spike, and surge protected
  • 0.1 - 0.8 average Amp draw
  • Conforms to SAE J994 Type C
  • Tough black ABS housing
  • Mounting: 4” W x 1.62” D x 2.73” H
  • -30° C to 77° C extreme temperature reliability
  • Full weatherproof/pressure washable IP65
  • Integrated ground clip
Image of VSM 326 Universal Self-Adjusting Vehicle Reversing Backup Alarm

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Part Number: VSM326


  • Self-Adjusting 87-112 dB, Digital Circuitry
  • 12-24 Volt Operation
  • Encapsulated circuit protects against moisture, vibration, shock
  • .8 Amp (or less) current draw
  • Conform to CE and UL standards
  • Tough polypropylene housing
  • Mounting: 4” (L) x 5” (W) x 3.11” (H

For the best in driving experience, choose backup warning alarms from VSM, the leader in heavy truck lighting technology.

Please note, backup warning alarms for fleet and heavy truck applications are only sold through authorized distributors. Please contact VSM to locate a distributor in your area for your reverse warning alarm needs.