Welcome to the world, Nest Protect. Perhaps you will vanquish the ear melting, banshee cry of the over-excited smoke detectors installed in every home we've ever cooked in. Let's see what you're packing:

Available with 6 AA Energizer Ultimate Lithium batteries or Wired for 120 V

Wi-Fi connectivity and wireless mesh networking with other Nest units

Photoelectric smoke sensor and carbon monoxide sensor

Heat and humidity sensors

Three activity sensors

Ambient light sensor