SM-2 Marker Lights

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Automatic Crew Overboard Marker Light

Model Number: 3940.1

With 70,000 peak candlepower, these high intensity Xenon strobe marker lights clearly mark crew-overboard sites with each brilliant flash.

More Information

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, 945
  • Eveready®: 510S

Suggested Battery Types, Spring Terminal Batteries:

  • ANSI/NEDA: 908, 908C, 908D, 908AC
  • Duracell: M908, PC908
  • Rayovac®: 941, 944
  • Eveready®: 509, 1209
  • Energizer: EN529 (not 529)
  • Panasonic: W-4FD


Product Number 3940.1
Size 13.8” x 4.8” (35 x 12 cm)
Weight 1.75 lbs (794 g)3.94 lbs (1.13 kg) with battery
Material UV stable polycarbonate blend
Color International orange
Operation Throw unit overboard or turn uprightand light will begin to work
Waterproof Drop tested 100 ft (33 m) into water
Battery Type 6V Lantern style battery. Go towww.acrelectronics for approval list
Beam Angle Omnidirectional 360°
Visibility 360° visibility for over 3 miles (4.8 km)
Flash Rate 60/minute
Lamp Xenon flash tube
Certification Complies with IMO/SOLAS/LSACode; USCG 161.010 & USCG 161.110approved; Tested to UL 1196
Carton Dimensions 6.5 x 5.0 x 11” (16.5 x 12.75 x 28 cm)
Units Per Carton 4
Carton Weight 15 lbs (7 kg)
Limited Warranty 1 year
Accessories Bulkhead bracket (P/N 9438.1); Top cap and pole strobe assembly (P/N9021.1); Repair kit (P/N 9286)


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.

Online Warranty Form

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