ACR-3995.3 Firefly 3 Rescue High-Intensity Strobe Light for Use in Search and Rescue Operations Ideal for life vests, safety harnesses, float coats, work suits, immersion suits, backpacks and flight suits State of the art lamp/lens combo for high intensity flash Large sliding switch allows for easy operation by gloved hands Integral lashing loops provide a secure anchor point Requires 2 AA batteries (lithium recommended and required for SOLAS & USCG approval)