All Daniamant Lifebuoy lights are designed to deliver, as a minimum standard, the 2cd output specification and 2 hour duration required by IMO SOLAS regulations.NSN: 6230-99-613-4941FeaturesSOLAS/MED approved5 year lifeNo maintenance or replacement batteries are requiredCompact size, easy fittingExempt from Class 9 transport requirements* Remember to order your mounting plate to ensure easy fixing when replacing your L41B or L120