The Whelen Self-Adjusting Back-Up Alarm Series is designed to provide an effective reverse warning while automatically adapting its sound level to the surrounding environment. Rather than operating continuously at one fixed volume, the alarm monitors ambient noise and adjusts its output approximately every half-second, helping maintain an audible warning without creating unnecessary noise.
Multiple sound-output ranges are available, allowing the alarm to be matched to the vehicle and operating environment. Configurations range from 77–97 dB up to 87–112 dB, making the series suitable for emergency vehicles, utility fleets, municipal equipment, work trucks, construction vehicles, and other vehicles operating around pedestrians or personnel.
Installation is straightforward with universal horizontal or vertical mounting and a choice of stud connections or blunt-cut wiring, depending on the model. The alarm is activated through the vehicle’s reverse-light circuit or back-up switch, allowing it to operate automatically whenever reverse is selected.
A glass-filled nylon housing and fully encapsulated electronics provide resistance to moisture, vibration, and corrosion for dependable service in demanding fleet environments.Depending on the model, configurations are available for 12–24 VDC or 12–48 VDC electrical systems, allowing the alarm to support a wide range of vehicles and equipment.
Automatically adjusts sound output to surrounding ambient noise
Re-evaluates ambient noise approximately every 0.5 second
Available sound ranges:
77–97 dB
77–102 dB
82–107 dB
87–112 dB
Connection options:
Stud terminals
Blunt-cut wire leads
Universal mounting:
Horizontal
Vertical
Controlled through:
Vehicle reverse-light circuit
Back-up switch
Electrical system options:
12–24 VDC
12–48 VDC on applicable models
Glass-filled nylon housing
Fully encapsulated construction
Designed for resistance to:
Moisture
Vibration
Corrosion
SAE Class F certified
Model families include:
BU7797
BU77102
BU82107
BU87112
Corresponding wire-lead versions
Approximate size varies by model:
Compact models: 4.02" W × 2.74" H × 1.65" D
Larger models: approximately 5.05–5.20" W × 3.20" H × 2.88" D
The Whelen Self-Adjusting Back-Up Alarm Series is designed to provide an effective reverse warning while automatically adapting its sound level to the surrounding environment. Rather than operating continuously at one fixed volume, the alarm monitors ambient noise and adjusts its output approximately every half-second, helping maintain an audible warning without creating unnecessary noise.
Multiple sound-output ranges are available, allowing the alarm to be matched to the vehicle and operating environment. Configurations range from 77–97 dB up to 87–112 dB, making the series suitable for emergency vehicles, utility fleets, municipal equipment, work trucks, construction vehicles, and other vehicles operating around pedestrians or personnel.
Installation is straightforward with universal horizontal or vertical mounting and a choice of stud connections or blunt-cut wiring, depending on the model. The alarm is activated through the vehicle’s reverse-light circuit or back-up switch, allowing it to operate automatically whenever reverse is selected.
A glass-filled nylon housing and fully encapsulated electronics provide resistance to moisture, vibration, and corrosion for dependable service in demanding fleet environments.Depending on the model, configurations are available for 12–24 VDC or 12–48 VDC electrical systems, allowing the alarm to support a wide range of vehicles and equipment.
Automatically adjusts sound output to surrounding ambient noise
Re-evaluates ambient noise approximately every 0.5 second
Available sound ranges:
77–97 dB
77–102 dB
82–107 dB
87–112 dB
Connection options:
Stud terminals
Blunt-cut wire leads
Universal mounting:
Horizontal
Vertical
Controlled through:
Vehicle reverse-light circuit
Back-up switch
Electrical system options:
12–24 VDC
12–48 VDC on applicable models
Glass-filled nylon housing
Fully encapsulated construction
Designed for resistance to:
Moisture
Vibration
Corrosion
SAE Class F certified
Model families include:
BU7797
BU77102
BU82107
BU87112
Corresponding wire-lead versions
Approximate size varies by model:
Compact models: 4.02" W × 2.74" H × 1.65" D
Larger models: approximately 5.05–5.20" W × 3.20" H × 2.88" D
