Sole distributor for Martek Products in the UK and Ireland: PRODUCTS / LIFEJACKET LIGHTS: M02510 Flashed Life Jacket Light: Type approval certificate from Turk Loydu according to EN394. Provides a flashing output 0,75cd. for minimum 8 hours. 50-70 flashes per minute. Works with 2 pieces of AA Alkaline or Lithium batteries. Batteries have 5 years shelf life. Water resistance. Easy mounting to the life jacket with the help of its cord. Martek flashing life jacket lights are sold with 2 pieces of Alkaline batteries. Diameter 26mm Length 147mm Weight 90 gr. M02511 Not Flashed Life Jacket Light: Type approval certificate from Turk Loydu according to EN394. Provides a flashing output 0,75cd. for minimum 8 hours. Works with 2 pieces of AA Alkaline or Lithium batteries. Batteries have 5 years shelf life. Water resistance. Easy mounting to the life jacket with the help of its cord. Martek flashing life jacket lights are sold with 2 pieces of Alkaline batteries. Diameter 26mm Length 147mm Weight 90 gr. M02515 Automatic Life Jacket Light: Provides 0,75cd.for minimum 8 hours in all directions of upper hemisphere 50-70 flashes per minute. Works with lithium battery. Activation automatic. Battery has 5 years shelf life. Water resistance. Weight 32 gr. Dimensions 40x49x32mm. For assembling, put the lifejacket light on the lifejacket belt and push the belt buckle upon the bead seat . M02516 Manual Life Jacket Light: Provides 0,75cd.for minimum 8 hours in all directions of upper hemisphere 50-70 flashes per minute. Works with lithium battery. Activation manual. Battery has 5 years shelf life. Water resistance. Weight 32 gr. Dimensions 40x49x32mm. For assembling, put the lifejacket light on the lifejacket belt and push the belt buckle upon the bead seat .