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🚨 Stay Seen, Stay Safe: The Ultimate Marine Signal Light You Can’t Afford to Miss!
The ACR Firefly Pro Waterbug is a SOLAS and USCG certified military-grade LED strobe light designed for marine safety. Featuring a powerful 41-candela output with 360° water-activated visibility over 3 miles, it offers SOS, strobe, and steady-on modes powered by long-lasting AA lithium batteries. Compact and rugged, it fits easily into life vests and survival kits, delivering reliable emergency signaling with up to 56 hours of strobe time—exceeding industry standards for durability and performance.




















| ASIN | B00KC68SVA |
| Best Sellers Rank | #154,870 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #42 in Boat Strobe & Safety Lights |
| Brand Name | ACR |
| Color | Yellow |
| Customer Reviews | 4.5 4.5 out of 5 stars (54) |
| Date First Available | October 3, 2013 |
| Included Components | Great Product |
| Item Dimensions LxWxH | 9.5 x 5.8 x 1.3 inches |
| Item Package Dimensions L x W x H | 9.06 x 5.75 x 1.3 inches |
| Item Weight | 0.15 Pounds |
| Manufacturer | ACR Electronics |
| Material | Plastic |
| Model Name | 3971.3 |
| Number of Items | 1 |
| Package Weight | 0.09 Kilograms |
| Part Number | 3971.3 |
| Size | One Size |
| Style | Lights |
| Suggested Users | unisex-adult |
| Warranty Description | Warranty |
J**.
Works like they say it does
Looks good and works fine. The light output is good and bright but I don't see the cost in the construction. The plastic is thin and they don't even supply batteries with it.
D**Y
Important safety feature
Good product size and illumination
O**N
NO ERA LA MARCA ESPERADA PERO ANDA CORRECTAMENTE
L**A
Great product
Fairly easy to set up. Great video on YouTube to help
J**M
Works perfectly
I bought one manual and one auto. I sprayed the auto with a plant sprayer and it did not turn on but as soon as I dunked it in water it came on. You must lubricate the seal as per manufacturer instruction with a silicone based lubricant. I also put a drop of silicone oil on the screw just in case. The screw itself is a bit delicate so Handle With Care when screwing on the base and it will last a long time. I see someone made a negative review but you cannot tell if this person followed the proper instructions which is possibly why it leaked if they did not put lubricant on the O-ring seal. In the automatic setting you can reset it by simply turning it on and off and maybe drying it the bit first. I think this is good for a locator signal light for short distances. In any case it's a great product and I'm a happy camper
P**L
Great Value. Add this in your pack!
Bought this to carry with me in my airplane. Peace of mind to know I have an additional tool to help me be found should the need arise.
K**S
Needed a new strobe for my first line gear. One with a common battery.
Typical ACR quality and durability. Hard to accidentally activate. Takes AA batteries as opposed to my old military issue model.
B**C
Easy to use.
Bright and easy to use. A valuable survival tool.
B**.
Great light and meets SOLAS requirements when you use lithium batteries. The best feature is the ability to arm it for water activation but turn it off in the torrential downpours
O**K
I wanted a new strobe primarily to use on a lifejacket, but also to take when walking in the hills. It's a bit pricey but I suppose worth the money and seems well made. I like that it is water activated (when 'armed' with the switch), but will also turn on manually for Strobe, Continuous on (for a basic area illumination - it's not a beam) and SOS in morse code. Bright enough. I tested it from a mile away and it could be seen, though the Odeo Distress Flare I also bought IS brighter and more relevant in a dire life/death emergency, but that only flashes on off and SOS every few seconds. This is multi-purpose, smaller and more easy to carry when walking. I'd suggest research both products if for walking/climbing. I'm happy.
S**D
Great
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