---
product_id: 4940544
title: "ACR 3971.3 Firefly PRO Solas Water Activated Rescue Strobe Light | boating-strobe-and-safety-lights"
brand: "acr"
price: "HK$1028"
currency: HKD
in_stock: true
reviews_count: 11
category: "Acr"
url: https://www.desertcart.hk/products/4940544-acr-3971-3-firefly-pro-solas-water-activated-rescue-strobe
store_origin: HK
region: Hong Kong
---

# 360° visibility over 3 miles 41+ candelas ultra-bright output 56 hours battery life ACR 3971.3 Firefly PRO Solas Water Activated Rescue Strobe Light | boating-strobe-and-safety-lights

**Brand:** acr
**Price:** HK$1028
**Availability:** ✅ In Stock

## Summary

> 🚨 Stay Seen, Stay Safe — The Ultimate Water Rescue Beacon

## Quick Answers

- **What is this?** ACR 3971.3 Firefly PRO Solas Water Activated Rescue Strobe Light | boating-strobe-and-safety-lights by acr
- **How much does it cost?** HK$1028 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/4940544-acr-3971-3-firefly-pro-solas-water-activated-rescue-strobe)

## Best For

- acr enthusiasts

## Why This Product

- Trusted acr brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rugged & Ready:** Military-grade casing built to survive the harshest marine environments without fail.
- • **360° Visibility:** Wide-angle LEDs create a full-circle beam visible from over 3 miles away, ensuring you're never out of sight.
- • **Unmatched Brightness:** Over 41 candelas of pure, cool white LED light cuts through the darkest waters.
- • **Endurance That Outlasts:** Up to 56 hours of continuous operation on a single AA lithium battery—twice the competition.
- • **Versatile Activation Modes:** Switch seamlessly between ultra-bright strobe, SOS distress, and steady-on for every rescue scenario.

## Overview

The ACR 3971.3 Firefly PRO is a compact, water-activated rescue strobe light engineered for extreme marine safety. Delivering over 41 candelas of bright, cool white LED light with 360° visibility up to 3 miles, it offers three critical modes—ultra-bright strobe, SOS, and steady-on. Powered by a single AA lithium battery, it runs up to 56 hours, doubling typical battery life. Built with military-grade durability and exceeding USCG and SOLAS standards, it mounts easily to life jackets or gear, making it an essential lifesaving tool for professionals and adventurers alike.

## Description

Product Description Great Product From the Manufacturer The Firefly PRO Waterbug LED Strobe Light is one of the brightest, most feature-packed emergency strobe lights available. With three activation modes—ultra-bright strobe, SOS strobe for Search and Rescue alerts, and Steady-On for close-up recovery—it’s designed to save lives in extreme conditions. Featuring an advanced light output management system, it produces over 41 candelas of light for up to 56 hours using AA lithium batteries. Its wide-light emission LEDs create a 360 beam visible over 3 miles, offering superior brightness with cool white light, free from yellow tinting. Built with a rugged military-grade casing, it withstands harsh environments. With a compact design, it fits easily inside life jackets or pockets for comfortable wearability. The Firefly PRO exceeds USCG and SOLAS requirements, offering twice the battery life of competitors. The included Velcro strap and lashing loops ensure quick and easy mounting to gear, keeping it within reach when you need it most.

Review: 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.
Review: 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.

## Features

- Great Product

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00KC68SVA |
| Batteries are Included | No |
| Best Sellers Rank | #151,309 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #54 in Boat Strobe & Safety Lights |
| Brand Name | ACR |
| Color | Yellow |
| Customer Reviews | 4.6 out of 5 stars 56 Reviews |
| Finish Type | Natural |
| Finish Types | Natural |
| Global Trade Identification Number | 00791659003411 |
| Included Components | Great Product |
| Item Dimensions L x W x H | 10"L x 8"W x 2"H |
| Item Length | 10 Inches |
| Item Type Name | Great Product |
| Item Weight | 0.15 Pounds |
| Light Source Special Features | Mode Switching (SOS, Steady-On, Strobe) |
| Light Source Type | Light Emitting Diode |
| Manufacturer | ACR Electronics |
| Manufacturer Part Number | 3971.3 |
| Manufacturer Warranty Description | Warranty. |
| Material | Plastic |
| Material Type | Plastic |
| Model Number | 3971.3 |
| Mounting Type | Table Mount |
| Number of Batteries | 1 Lithium Ion batteries required. |
| Number of Light Sources | 1 |
| Power Source | Battery Powered |
| Shape | Rectangular |
| Smart Home Compatibility | Not Smart Home Compatible |
| Specification Met | approved |
| Style Name | Lights |
| UPC | 791659003411 |
| Unit Count | 1.0 Count |
| Voltage | 12 Volts |

## Product Details

- **Color:** Yellow
- **Finish Type:** Natural
- **Light Source Type:** Light Emitting Diode
- **Material:** Plastic
- **Shape:** Rectangular

## Images

![ACR 3971.3 Firefly PRO Solas Water Activated Rescue Strobe Light | boating-strobe-and-safety-lights - Image 1](https://m.media-amazon.com/images/I/71lF2grKeYL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works like they say it does
*by J***. on July 13, 2024*

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.

### ⭐⭐⭐⭐⭐ Needed a new strobe for my first line gear. One with a common battery.
*by K***S on October 12, 2021*

Typical ACR quality and durability. Hard to accidentally activate. Takes AA batteries as opposed to my old military issue model.

### ⭐⭐⭐⭐⭐ Important safety feature
*by D***Y on August 19, 2025*

Good product size and illumination

## Frequently Bought Together

- ACR Firefly Pro Waterbug LED Strobe Light – Military-Grade, SOS & Steady-On Modes, SOLAS & USCG Certified, High-Intensity Marine Safety, Emergency Visibility & Durability (3971.3)
- LuxoGear Emergency Whistles with Lanyard Safety Whistle Survival Shrill Loud Blast for Kayak Life Vest Jacket Boating Fishing Boat Camping Hiking Hunting Rescue Signaling Kids Lifeguard Plastic 2 Pack
- ACR HemiLight3 HL3 Automatic Survivor Locator Light, Med, Solas, and USCGC Approved, Ensures Reliable, Automatic Distress Signaling for Swift Rescue in Emergencies.

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.hk/products/4940544-acr-3971-3-firefly-pro-solas-water-activated-rescue-strobe](https://www.desertcart.hk/products/4940544-acr-3971-3-firefly-pro-solas-water-activated-rescue-strobe)

---

*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-07-21*