ACR FireFly PRO Waterbug SOLAS Water-Activated Strobe Light 3971.3
ACR FireFly Pro Waterbug Strobe Light (Carded) – 3971.3
ACR marine safety equipment – UK stock
A compact ACR emergency signalling light for lifejackets, survival bags and personal marine safety equipment. The Waterbug version can activate automatically on contact with water when armed, while its manual controls provide strobe, SOS strobe and steady-light functions.
Key Features
- ✔ Waterbug water activation when armed and immersed.
- ✔ Manual strobe, SOS strobe and steady-on modes.
- ✔ Cool-white LED with 360° beam.
- ✔ Two lashing points and hook-and-loop mounting strap.
- ✔ Supplied carded (retail card packaging).
Technical Specs
| Brand / model | ACR FireFly Pro Waterbug, carded |
| ACR part number | 3971.3 |
| Dimensions | 117 × 57 × 28 mm |
| Weight | 68 g without batteries |
| Battery | 2 × AA, not included |
Compatibility / Fitment Guide
- Attach to an inflatable or foam lifejacket, or store in a grab bag, liferaft pack or abandon-ship kit.
- Suitable for sailing yachts, motorboats, RIBs, fishing vessels, charter craft and workboats.
- Secure with the lashing points and strap so the light stays visible and accessible. Fit fresh batteries before departure and arm the unit only when automatic water activation is required.
- A visual signalling aid only; it does not replace a PLB, EPIRB, AIS MOB beacon, lifejacket or other equipment required for the vessel and voyage. Check your vessel's carriage requirements before relying on it as required equipment.
OEM Cross Reference
| ACR part number | 3971.3 |
| Lalizas code | 22141 |
| 4Boats SKU | 22141 |
Questions & Answers
Does it switch on automatically in water?
Yes. The Waterbug version supports automatic water activation when the unit is correctly armed.
Can it also be operated manually?
Yes. Strobe, SOS strobe and steady-on functions can be selected manually.
Is it suitable for a lifejacket?
Yes. Its compact housing, lashing points and strap allow mounting to a lifejacket, belt or survival pack. Mount it so the light is not obscured.
Are batteries supplied?
No. Two AA batteries are required; follow the ACR instructions for the recommended type.
Note: Please check the specifications and compatibility details above before ordering. For fitment questions, contact us via 4boats.co.uk.
Delivery
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Returns
Something not quite right? You have 14 days from the day you receive it, to send something back.
Please note, we cannot offer refunds on fashion face masks, cosmetics, pierced jewellery, adult toys, and swimwear or lingerie if the hygiene seal is not in place or has been broken. Items of footwear and/or clothing must be unworn and unwashed with the original labels attached. Also, footwear must be tried on indoors. Items of homeware including bedlinen, mattresses, and toppers, and pillows must be unused and in their original unopened packaging. This does not affect your statutory rights.
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