Hardwired 2-in-1 LED Strobe and Smoke Detector with 10-Year Battery Back-UpThe Kidde P4010ACLEDS 2 is an integrated 120 Volt AC wire in smoke alarm with 10 year sealed battery backup and LED strobe light that provides temporal patterns, visual and voice warnings. If smoke is detected, the P4010ACLEDS 2 will produce a steady flash warning (once per second) and sound 3 long beeps, followed by Fire repeating. The LED ring will flash red in conjunction with the audible beeps. When triggered by an interconnected carbon monoxide