Small, compact, rugged, waterproof; pack inside inflatable life jacket or attach to standard life vest Pull-pin activation: Automatically lights when vest inflates or if manually pulled Pull-pin lanyard clips to bottom of inflation chamber Light test feature with "Test Key" to ensure readiness-can be tested many times Easy to mount-fits on inflation tube via ‘O’ Ring which will not damage inflation tube, or fits on any strap of conventional life jacket "Tamper Tab" breaks to indicate light has been activated Long term storage lithium battery-10 year storage life (recommended replacement 5 years from date of purchase-write month/year of replacement date on case at time of purchase) Operating life-approximately 8 hours continuous at -20ºC (-4ºF) Size: 3.1 L x 1.8 W x 1.6 D in (7.9 L x 4.6 W x 4.1 D cm) Weight: 2.3 oz (65 g) Material: UV stabilized composite polymer Color: Hi-Viz Yellow Operation: Pull-pin activation; automatic on some vests, manual activation when pulled by hand Beam Angle: 13º vertical; 2º horizontal Visibility: 15 cd vertical; 2.5 cd horizontal; 2m (3.2 km) Lamp: Steady light (incandescent) Battery Type: Lithium; 10-year storage life (5-year replacement life) Limited Warranty: 1 year Carton Dimensions: 9.5 x 12.0 x 6.0 in (24.0 x 31.0 x 15.0 cm) Units Per Carton: 12 Carton Weight: 3 lbs. (1.35 kg) Operational Life: Approximately 8 hours continuous at -20ºC (-4ºF)