SM-2 Marker Light

Automatic Crew Overboard Marker Light
Model Number: 3940.1

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With 70,000 peak candlepower, this highintensity Xenon strobe clearly marks a crew-overboard site with each brilliant flash.

It automatically rights itself and activates when in the water and begins strobing, operating for up to 60 hours on a 6-volt lantern battery. Perfect for commercial marine, petro-marine, cruisers and any application needing a reliable COB light.

  • Brighter light in all directions
  • Upgraded polycarbonate blend case, improved impact rating; UV, temperature and chemical resistant
  • Perfect for commercial marine, petro-marine, divers, cruisers, and any application needing a reliable COB light
  • Automatically rights itself and activates when in the water
  • High intensity Xenon strobe gives 360° visibility for more than 3 miles (4.8 km)
  • Floats upright in all conditions
  • Minimum 36 hours continuous operating life

A Matter of Balance
Marker lights, by design, need to float upright for maximum visibility. The 6-volt lantern batteries provide the ballast for these lights. Although batteries may be the same size, the different chemistries cause them to have varying weights. It is imperative that only the 6-volt battery models suggested are used. Too little ballast and the light will lie over on its side and be ineffective; too much weight and the light may sink. If there are any doubts as to the appropriate weight of the battery, test the light by placing it in shallow water. If it floats upright, it is good, however, if the SM-2 sinks, the battery is too heavy.


Suggested Battery Types, Screw Terminal Batteries:

  • ANSI/NEDA: 915, 915C, 915D, 915AC
  • Duracell: M915, PC915
  • Rayovac®: 942, 944
  • Eveready®: 510S

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Product Number3940.1
Size13.8” x 4.8” (35 x 12 cm)
Weight1.75 lbs (794 g)3.94 lbs (1.13 kg) with battery
MaterialUV stable polycarbonate blend
ColorInternational orange
OperationThrow unit overboard or turn uprightand light will begin to work
WaterproofDrop tested 100 ft (33 m) into water
Battery Type6V Lantern style battery. Go towww.acrelectronics for approval list
Beam AngleOmnidirectional 360°
Visibility360° visibility for over 3 miles (4.8 km)
Flash Rate60/minute
LampXenon flash tube
CertificationComplies with IMO/SOLAS/LSACode; USCG 161.010 & USCG 161.110approved; Tested to UL 1196
Carton Dimensions6.5 x 5.0 x 11” (16.5 x 12.75 x 28 cm)
Units Per Carton4
Carton Weight15 lbs (7 kg)
Limited Warranty1 year
AccessoriesBulkhead bracket (P/N 9438.1); Top cap and pole strobe assembly (P/N9021.1); Repair kit (P/N 9286); Stainless Steel Lifeline Bracket (P/N9566)

Warranty Length:  1 Year

This product is warranted against factory defect in material and workmanship for a period of 1 (one)* year from date of purchase or receipt as a gift. During the warranty period ACR Electronics, Inc. will repair or at its option, replace at no cost to you for labor, materials or return transportation.


For further assistance, please contact our Technical Service Department at :

ACR Electronics, Inc.
5757 Ravenswood Road
Fort Lauderdale, FL 33312-6645.

Email: service@acrelectronics.com, Fax: +1 (954) 983-5087, Telephone: +1 (954) 981- 3333.

This warranty does not apply if the product has been damaged by accident or misuse, or as a result of service or modification by other than the manufacturer.  The COMPANY MAKES NO REPRESENTATION OR WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, AS TO MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR ANY OTHER MATTER WITH RESPECT TO THIS PRODUCT, except as otherwise expressly stated in the previous paragraph. The Company shall not be liable for consequential or special damages. In order to place the warranty in effect, choose a form above and complete it entirely. Or you may fill out the registration card accompanying your product (if applicable) which must be returned to ACR Electronics, Inc. within ten days of purchase.

*Five Years for the following products:  EPIRB, PLB ,  S-VDR,  SSAS.

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