Item is "made-to-order". Please call for approximate lead time. 100% Non-Refundable. XB4 high output (21 Joule) strobes have been designed for use in potentially explosive atmospheres and harsh environmental conditions. The marine grade alloy or stainless steel enclosures are suitable for use offshore or onshore, where light weight combined with corrosion resistance and strength is required. Units can be painted to customer specification and fitted with identification labels.