Mount the Flow Monkey Gustaf smoke detector to the ceiling or the wall of the nursery or any other room. You attach this playful detector using tape or the mounting materials included. Since the smoke detector runs on a 9V battery, you're never tied to a wall socket. That's pretty convenient. The battery lasts about 1 year, and the smoke detector will sound a beep when it needs to be replaced. It's up to you then to replace the battery quickly. When smoke is detected, the smoke detector produces a loud audio signal of 85dB. Test the smoke detector once a month with the test button, to make sure that it's working as it should.