Fixed Tonal Back-Up Alarms
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 Whelen Fixed Tonal Back-Up Alarm for use on emergency vehicles
front view image of Whelen Fixed Tonal Back-Up Alarmwith wiring
diagonal front view image of Whelen Fixed Tonal Back-Up Alarm for use on emergency vehicles
Back-Up Alarm, 97dB, 12-24 VDC, Light Duty, Surface Mount, Stud Connection
diagonal front view image of Whelen Fixed Tonal Back-Up Alarm with wiring
Whelen self-adjusting metal backup alarm switch with long adjustment screw.

BU97LD

BU97LL

BU112HD

BU112HL

BU97LD

BU97BLD

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.
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
Application type: Light Duty or Heavy Duty
Decibel Options:
- Light Duty 87dB, 87dB, or 102dB
- Heavy Duty 107dB or 112dB
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 B, C, D and F
Warranty

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

Please see our warranty statement for more information here.

Voltage87dB: 12-80 VDC
97dB: 12-24 VDC
102dB: 12-24 VDC
107dB: 12-36 VDC
112dB: 12-36 VDC
Size

Light Duty:
BU87LD, BU97LD, BU102LD, BU87LL, BU97LL, BU102LL:
4.02” (10.21cm) W x 2.74” (6.96cm) H x 1.65” (4.19cm) D

Heavy Duty:
BU107HD, BU112HD, BU107HL, BU112HL:
5.20” (13.20cm) W x 3.20” (8.12cm) H x 2.88” (7.31cm) D

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

Light Duty
BU87LD
BU87LD

BU87LD

Back-Up Alarm, 87dB, 12-80 VDC, Universal Mount, Stud Connection
BU97LD
BU87LD

BU87LD

Back-Up Alarm, 97dB, 12-24 VDC, Light Duty, Universal Mount, Stud Connection
BU97BLD
Back-Up Alarm, 97dB, 12-24 VDC, Light Duty, Surface Mount, Stud Connection

BU97BLD

Back-Up Alarm, 97dB, 12-24 VDC, Surface Mount, Stud Connection
BU102LD
BU87LD

BU87LD

Back-Up Alarm, 102dB, 12-24 VDC, Surface Mount, Stud Connection
BU87LL
BU87LL, BU97LL, BU102LL, BU7797L, or BU77102L (Same Housing)

BU87LL, BU97LL, BU102LL, BU7797L, or BU77102L (Same Housing)

Back-Up Alarm, 87dB, 12-80 VDC, Universal Mount, Blunt Cut Wires
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
BU97BLL
Back-Up Alarm, 97dB, 12-24 VDC, Light Duty, Surface Mount, Blunt Cut Wires

BU97BLL

Back-Up Alarm, 97dB, 12-24 VDC, Surface Mount, Blunt Cut Wires
BU102LL
BU87LL, BU97LL, BU102LL, BU7797L, or BU77102L (Same Housing)

BU87LL, BU97LL, BU102LL, BU7797L, or BU77102L (Same Housing)

Back-Up Alarm, 102dB, 12-24 VDC, Universal Mount, Blunt Cut Wires
Heavy Duty
BU107HD
BU112HD
front view image of black Whelen Fixed Tonal Back-Up Alarm

BU112HD

BU112HD

Back-Up Alarm, 107dB, 12-36 VDC, Universal Mount, Stud Connection
BU112HD
front view image of black Whelen Fixed Tonal Back-Up Alarm
BU112HD

BU112HD

BU112HD

Back-Up Alarm, 112dB, 12-36 VDC, Heavy Duty, Universal Mount, Stud Connection
BU107HL
diagonal front view image of Whelen Fixed Tonal Back-Up Alarm with wiring
BU107HL, BU112HL, BU82107L, or BU87112L (Same Housing)

BU112HL

BU107HL, BU112HL, BU82107L, or BU87112L (Same Housing)

Back-Up Alarm, 107dB, 12-36 VDC, Universal Mount, Blunt Cut Wires
BU112HL
diagonal front view image of Whelen Fixed Tonal Back-Up Alarm with wiring
BU107HL, BU112HL, BU82107L, or BU87112L (Same Housing)

BU112HL

BU107HL, BU112HL, BU82107L, or BU87112L (Same Housing)

Back-Up Alarm, 112dB, 12-36 VDC, Heavy Duty, Universal Mount, Blunt Cut Wires
Switch
BUSW1
Whelen self-adjusting metal backup alarm switch with long adjustment screw.

BUSW1

Back-Up Alarm Switch