Does this replace my smoke alarm?
No. Your smoke alarm tells your family to get out. Rescue Retriever tells firefighters where to find your pet once they're inside. Keep your existing alarms. Add Rescue Retriever where your pet sleeps or hides. They do completely different jobs.

How is this different from a pet alert window sticker?

A sticker tells firefighters you have pets before they enter. Rescue Retriever tells them exactly where your pet is hiding once they're inside. When smoke hits the device, a powerful silent strobe activates and cuts through darkness and smoke — giving first responders a direct visual signal to your pet's location. A sticker is a notice. Rescue Retriever is a rescue signal.