R these approved for survival suits and by coast guards ?

uscg 161.012/93/0 & 161.112/92/0 I don't know about survival suits, but I would think so. this is very similar to the military version only this has an led which are usually more reliable than other types of bulbs.

does this light have sos mode

According to the manufacturer, it does. See https://www.acrartex.com/media/1376913/y1-06-0290-rev-c.pdf instruction card for directions. It turns on as a strobe, If you immediately turn it off and back on it is a steady light, repeat the off/on toggle again for SOS mode.

What type of batteries powers these?

Two AA batteries. I recommend lithium for their long shelf life.

can I use this on my vest to go snorkeling?

According to the ACR spec sheet the Firefly is factory tested waterproof to 33ft (10M) depth.

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ACR 3970.3 Firefly PRO Solas Manually Operated Rescue Strobe Light, Carded

Product ID: 54705262

Details

Colour
Yellow
Finish type
Painted or
Light source type
Led
Material
Plastic
Shape
Rectangular

⚡3 versatile lighting modes

🎒compact, PFD-friendly design

🛡️military-grade rugged durability

€ 161.05

Duties & taxes included

In stock

Sold byAmazon NetherlandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚨 Stay Seen, Stay Safe – The Ultimate Rescue Signal in Your Pocket

BUILT TO ENDURE - Military-grade construction withstands extreme conditions
QUICK ACCESS MOUNTING - Easy lashing loops for secure attachment to gear or lifejackets
TRIPLE MODE VISIBILITY - Strobe, SOS, and Steady-On for ultimate emergency signaling
SPACE SMART COMPACTNESS - Fits seamlessly inside your PFD without bulk
BATTERY POWERED RELIABILITY - Runs on standard AA batteries for hassle-free power

The ACR 3970.3 Firefly PRO SOLAS Manually Operated Rescue Strobe Light is a compact, military-grade LED signaling device featuring three lighting modes—Strobe, SOS, and Steady-On. Designed for extreme durability and easy attachment to personal flotation devices, it ensures high-visibility emergency signaling powered by standard AA batteries.

Specifications

ASIN	B00JCB3NWA
Amperage	13.67 Milliamps
Batteries are Included	No
Battery Description	AA batteries
Beam Angle	3 Degrees
Best Sellers Rank	88,235 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 12 in Boat Strobe & Safety Lights
Brand Name	ACR
Bulb Base	Wedge
Bulb Shape Size	S6
Colour	Yellow
Country Of Origin	USA
Customer Reviews	4.2 4.2 out of 5 stars (48)
Finish	Painted or Powder Coated
Global Trade Identification Number	00791659003404
Included Components	Great Product
Item Dimensions L x W x H	44L x 12W x 22H millimetres
Item Shape	Rectangular
Item Type Name	Great Product
Item Weight	0.25 Pounds
Light Source Special Features	Wide light emission LEDs
Manufacturer	ACR Electronics
Manufacturer Part Number	3970.3
Material	Plastic
Maximum Compatible Wattage	5 Watts
Model Number	3970.3
Mounting Type	[Customizable]
Number of Batteries	2 AA batteries required.
Number of Items	1
Number of Lights	2
Number of Packs	1
Power and Plug Description	Battery Powered
Set Name	Firefly PRO SOLAS
Shade Material	Plastic
Style	Compact
Type of Bulb	Led
UPC	791659003404
Unit Count	1.0 count
Wattage	5 watts

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