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

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

Product ID: 54705262

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Details

Colour
Yellow
Shape
Rectangular
Material
Plastic
Finish type
Unfinished
Light source type
Led

⚡3 versatile lighting modes

🎒compact, PFD-friendly design

🛡️military-grade rugged durability

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

Color	Yellow
Size	One Size
Style	Compact
Height	8 inches
Item display length	8 inches
Weight	91 g
Item display width	8 inches
Shape	Rectangular
Light source	Led
Material type	Plastic
Number of items	1
Power source	Battery Powered
Included components	Great Product
Batteries included?	No
tech_spec_battery_description_toys	AA batteries
Brand	ACR
Department	Unisex
Manufacturer	ACR Electronics
Item model number	3970.3
Product Dimensions	5.59 x 3.05 x 11.18 cm; 40.82 g
ASIN	B00JCB3NWA

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