ACR Firefly PRO WATERBUG SOLAS LED Strobe Light, Manual & Automatic Water Activation, Bulk Packaging (3971.4)

The ACR Firefly PRO WATERBUG is a high-visibility survivor strobe for life-jacket mounting, grab bags and marine rescue readiness. Its bright white LED output can be set to strobe, steady illumination or SOS, offering a useful combination of attention-getting and close-range lighting modes. The WATERBUG version also activates automatically when its water sensors are immersed, while retaining manual controls. This is the bulk-packaged configuration.

Key Features & Benefits

• High-visibility strobe: 41-candela peak output with published visibility over 3 miles.
• Three illumination modes: Switch among strobe, steady-on and SOS.
• Activation: Automatic water sensing plus manual mode selection.
• Runtime: Up to 56 hours in strobe mode, 28 hours steady and 30 hours SOS with specified batteries.
• Rescue-ready construction: White LED light, waterproof design and convenient lashing loops.

Technical Specifications

• Strobe peak intensity: 41 candela
• Steady light intensity: 16.8 candela
• Strobe peak output: 257 lumens
• Steady light output: 105 lumens
• Visibility: Over 3 miles
• Flash rate: Approximately 60 flashes per minute
• Operating modes: Strobe; steady-on; SOS
• Water activation: Yes
• Strobe runtime: 56 hours
• Steady-on runtime: 28 hours
• SOS runtime: 30 hours
• Battery: AA batteries; lithium recommended for rated runtime
• Waterproof test: 33 ft (10 m)
• Dimensions: 4.4 x 2.2 x 1.2 in (11.7 x 5.7 x 2.8 cm)
• Weight without batteries: 2.43 oz (69 g)
• Approvals: SOLAS, USCG, IMO LSA, MED, CE, FAA TSO-C85b
• Packaging: Bulk

Compatibility

For personal rescue signaling and PFD/webbing attachment. WATERBUG automatic activation is exclusive to models 3971.3 and 3971.4; manually operated 3970-series models do not activate when wet.

Installation & Use

Fit the strap to life-jacket webbing, install AA batteries following polarity markings, and test each operating mode. For WATERBUG, follow the arming procedure before use.

Warranty

1-Year Limited Warranty

What's in the Box

• Firefly PRO WATERBUG LED strobe light
• Hook-and-loop webbing mounting strap