Simply plug into any USB-A powered outlet and it will emit random beeps at intervals between 3-8 minutes or every 60 minutes, as per your selection. Choose your preferred beep frequency, either random or 60 minutes, using the device's switch. Please exercise patience and wait up to 8 minutes for the first beep (you may set a timer on your phone). There's no start button; just plug it in and wait. It features a standard USB-A connection and will function as long as it has power; for instance, a TV that's off won't produce beeps until it's turned on.