ACR Firefly PRO Waterbug Emergency Strobe Light, Part 3971-3, SOLAS/USCG Approved Water-Activated Strobe

The ACR Firefly PRO Waterbug (part number 3971-3) is a SOLAS-approved emergency strobe light built with a water activation feature that automatically turns the light on once it is submerged. The Firefly PRO Waterbug offers four activation functions: an armed mode for automatic water activation, an ultra-bright strobe mode, an SOS strobe mode to visually signal Search and Rescue of your location, and a Steady-On mode for close-up recovery operations. Its cool white LED light has no yellow tinting, giving a more visible beam that can be seen at greater distances than a warm-toned light.

Wide light emission LEDs produce a 360 degree beam of light at 41 candela, giving a visibility range of over 3.5 miles. An energy efficient microprocessor and redesigned electronics maximize operation life in harsh conditions. Running on a single set of AA alkaline batteries, the Firefly PRO Waterbug strobes continuously for over 56 hours, or runs the Steady-On feature for 28 hours, exceeding USCG and SOLAS minimum requirements. The compact 4.4 x 2.2 x 1.2 inch housing fits easily inside an inflatable life jacket or a pocket for comfortable wearability, and the military spec casing is built to withstand years of abuse in harsh marine environments. Two lashing loops plus an included Velcro strap make it easy to mount the strobe to a life jacket, belt, or pack so it is readily accessible when needed. The unit is factory tested waterproof to 33 feet (10 m) and is backed by a 1 year manufacturer warranty.

Specifications

• Brand: ACR
• Manufacturer Part Number: 3971-3
• Activation Modes: Armed (water activation), Strobe, SOS Strobe, Steady-On
• Waterproof Rating: Factory tested to 33 feet (10 m)
• Lamp Type: Cool White LED
• Strobe Intensity: 41 candela
• Strobe Visibility: Over 3.5 miles
• Strobe Flash Rate: 60 flashes per minute +/-
• Strobe Operation Time: 56 hours minimum
• Steady-On Operation Time: 28 hours
• Certification: SOLAS, USCG, MED, TSO-C85b, IMO LSA, CE
• Power Source: AA alkaline batteries (not included)
• Dimensions: 4.4 inches x 2.2 inches x 1.2 inches
• Weight: 1 pound
• Material: Plastic
• Color: Yellow
• Mounting: Two lashing loops with included Velcro strap
• Warranty: 1 year manufacturer warranty

Frequently Asked Questions

What is the ACR Firefly PRO Waterbug Emergency Strobe Light? It is a SOLAS-approved emergency strobe light, ACR part number 3971-3, that features a built-in water activation function so it automatically turns on once submerged.

Does the Firefly PRO Waterbug turn on by itself in water? Yes, when set to Armed mode the ACR 3971-3 automatically activates its strobe once it is submerged in water.

How long will the strobe run on a set of batteries? The Firefly PRO Waterbug strobes continuously for 56 hours minimum on a single set of AA alkaline batteries, or 28 hours when running the Steady-On feature.

What batteries does the ACR 3971-3 use? A single set of AA alkaline batteries powers the Firefly PRO Waterbug; batteries are not included with the unit.

Is this strobe light SOLAS and USCG approved? Yes, the Firefly PRO Waterbug is certified SOLAS, USCG, MED, TSO-C85b, IMO LSA, and CE.

How bright is the Firefly PRO Waterbug strobe? The strobe produces 41 candela of light in a 360 degree beam using cool white LEDs, giving visibility of over 3.5 miles.

What is the waterproof rating of part 3971-3? ACR factory tests the Firefly PRO Waterbug waterproof to 33 feet (10 m).

What are the dimensions and weight of this strobe light? The ACR Firefly PRO Waterbug measures 4.4 inches x 2.2 inches x 1.2 inches and weighs 1 pound.

How do you mount the strobe to a life jacket? Two lashing loops on the housing plus the included Velcro strap let you mount the Firefly PRO Waterbug to a life jacket, belt, or pack.

What is the difference between Strobe mode and Steady-On mode? Strobe mode gives the ultra-bright flashing signal used to alert Search and Rescue, while Steady-On mode provides a constant light intended for close-up recovery operations on the ACR 3971-3.

What is the housing made of? The Firefly PRO Waterbug uses a rugged, military spec plastic casing designed to withstand years of abuse in harsh marine environments.

Does the Firefly PRO Waterbug come with batteries included? No, the ACR 3971-3 requires a single set of AA alkaline batteries that are sold separately.