ACR MS2000M STROBE LIGHT
The MS-2000 (M) distress marker light has come a long way since you purchased ACR's original Firefly back in the 1960s.Here are a few of the new features found in all of our MS-2000(M) models:- Shield extends/retracts for omni- or uni-directional visibility- Waterproof down to 50ft (15.3m)- IR filter blocks all visiblelight (lets through only IR light)- Raised polarity indicators allow correct battery replacement in low or no visibility conditions- New braided steel retainer keeps battery door from being lost- Operates on 2 standard alkaline AA batteries - disposal causes no environmental impact- For extreme cold environments or long term storage, use 2 common lithium batteries- Blue filter distinguishes strobe from ground fire when in placeSpecificationsProduct Number: 3990 MS-2000(M)T- Size: 4.5 x 2.2 x 1.1 in (11.4 x 5.6 x 3.3 cm)- Weight: 4.0 oz (115 g) without batteries- Light Output: 250,000 peak lumens per flash- Flash Rate: 50  10 per minute- Light Dispersion: White-omnidirectional, IR-omnidirectional, Blue-unidirectional- Operating Life: 8 hours minimum-strobe  2 hours minimum-incandescent- Visibility: Military tested at a distance of 6 miles (9.6km) on a clear dark night- Waterproof: To a depth of 50ft (15.3m)  200ft (61m) diver version available- Batteries: 2 AA alkaline or lithium batteries (not included)- Case Color: Black with olive drab flashguard- Construction: Case, lens and flashguard-high impact polycarbonate  IR filter-butyrate- Activation: Spark proof magnetic reed switch- Limited Warranty: 1 year- Federal Stock Number (FSN): 3990 only: 6230-01-411-8535