Integrated smoke alarm with LED strobe light. 10 year sealed-in battery backup. Integrated photoelectric smoke alarm and LED. Strobe light, a single unit can be installed, where previously a separate smoke alarm and strobe light were needed. It requires only one electrical box, reducing labour costs and installation time. No relay required. Low profile bright 177 Candela LED strobe light, light level proven effective in warning those with hearing loss. Attractive low profile design. Synchronized flash rates, strobe flashes will automatically synchronize (flash at the same time) with other interconnected P4010ACLEDSCA's, in an alarm condition. 120 V Interconnectable with 10-year sealed lithium. Battery backup, will interconnect with up to 24 other Kidde devices.