Q: On clear days I search in silence, my cool eye a shade of pale; In billowing thickness with glaring red eye, I screech and wail. My power keeps you from the glow. Ever-ready, you'll know to go. Effete, you'll probably be too slow.
A: A smoke detector. clear days - no smoke, the light is clear. thickness - smoke, the light is red, it goes off. Ever-ready - like the battery brand. Effete - no power, it won't work.