Fixed Tonal Back-Up Alarms
front view image of Whelen Fixed Tonal Back-Up Alarm for use on emergency vehicles
front view image of Whelen Fixed Tonal Back-Up Alarmwith wiring
front view image of black Whelen Fixed Tonal Back-Up Alarm
front view image of Whelen Fixed Tonal Back-Up Alarm with wiring
front view image of black Whelen Fixed Tonal Back-Up Alarm
diagonal front view image of Whelen Fixed Tonal Back-Up Alarm with wiring
diagonal front view image of Whelen Fixed Tonal Back-Up Alarm for use on emergency vehicles
diagonal front view image of Whelen Fixed Tonal Back-Up Alarm with wiring
BUSW1

BU112HD

BU112HL

BU97LD

BU97LL

BU112HD

BU112HL

BU97LD

BU97LL

BUSW1

Fixed Tonal Back-Up Alarms

Our Fixed Tonal Back-Up Alarms provide reliable safety solutions for vehicles in a variety of applications and environments. Offering output ranges up to 112dB, these alarms deliver clear and effective auditory warnings to enhance workplace safety. Designed with universal and surface mounting options, stud or flying lead connections, and compatibility with 12-24 or 12-36 VDC systems, these alarms ensure versatile and easy installation. Whether for smaller work trucks and utility vehicles or heavy-duty construction equipment, our alarms are built to perform consistently and withstand demanding conditions.
Features
  • Enhanced Safety: Clear and effective auditory warnings to improve workplace safety across all environments
  • Versatile Installation: Flexible universal and surface mounting options with stud or blunt cut wire connections
  • Reliable Performance: Engineered to deliver consistent operation from light-duty to heavy-duty vehicles
  • Rugged Durability: Built to withstand tough and demanding conditions, ensuring long-lasting performance
Specifications
Please note: Not all specifications will apply to every model. Consult your sales representative to confirm specs.
Alarms

Light Duty:
BU97LD Models: 97dB, Universal Mount, Stud Connection
BU97LL Models: 97dB, Universal Mount, Wire Connection

Heavy Duty:
BU112HD Models: 112dB, Universal Mount, Stud Connection
BU112HL Models: 112dB, Universal Mount, Wire Connection

TonesStandard back-up warning tone
ControlControlled by connection to vehicle’s back-up lights and back up switch BUSW1
CustomizationFixed Tonal Alarms: Designed to meet the specified dB rating
Decibel: Available in two decibel levels from 87dB to 112 dB
Application type: Light-Duty or Heavy-Duty
ConstructionHousing: Glass filled nylon
Fully Encapsulated: Moisture, vibration, and corrosion resistance
MountingUniversal Mount: Horizontal or Vertical
Surface Mount
Included Cables & HardwareBlunt cut wire or stud connections
CertificationsSAE Class C and F
Warranty

Light Duty: 2-year
Heavy Duty: 5-year

Please see our warranty statement for more information here.

Voltage97dB: 12-24 VDC
112dB: 12-36 VDC
Size

Light Duty:
Width: 4.02” (10.21cm)

Height: 2.74” (6.95cm)

Depth: 1.65” (4.19cm)

Heavy Duty:
Width: 5.20” (13.20cm)
Height: 3.20” (8.12cm)
Depth: 2.88” (7.31cm)

Fixed Tonal Back-Up Alarms
Fixed Tonal - BU112HD
BU112HD
BU97LL Fixed Tonal Back Up Alarm
BU97LL

Light Duty
BU97LD
front view image of black Whelen Fixed Tonal Back-Up Alarm

BU97LD

Back-Up Alarm, 97dB, 12-24 VDC, Light Duty, Universal Mount, Stud Connection
BU97LL
front view image of Whelen Fixed Tonal Back-Up Alarm with wiring

BU97LL

Back-Up Alarm, 97dB, 12-24 VDC, Light Duty, Universal Mount, Blunt Cut Wires
Heavy Duty
BU112HD
front view image of black Whelen Fixed Tonal Back-Up Alarm

BU112HD

Back-Up Alarm, 112dB, 12-36 VDC, Heavy Duty, Universal Mount, Stud Connection
BU112HL
diagonal front view image of Whelen Fixed Tonal Back-Up Alarm with wiring

BU112HL

Back-Up Alarm, 112dB, 12-36 VDC, Heavy Duty, Universal Mount, Blunt Cut Wires
Switches
BUSW1
BUSW1

BUSW1

Back-Up Alarm Switch