PLEASE SEE PICTURE BEFORE BUYING THIS UNIT. WHAT YOU SEE IN THE PICTURE THAT IS WHAT YOU GET BRK First Alert SC9120FF SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm The First Alert SC9120B Hardwired Combination Smoke and Carbon Monoxide Alarm is a hardwire alarm with battery backup. The hardwired detector includes a 9-volt battery backup for continued function in the event of a power outage. This combination fire and CO detector features a test/silence button and tamper-resistant locking brackets. The alarm can be connected to other compatible BRK and First Alert hardwired smoke and carbon monoxide detectors and comes equipped with easy-adapter plugs so there is no need to rewire. Its latching alarm indicator automatically identifies which detector initiated the alarm ??? even after the conditions that set off the alarm have subsided. Can connect to other compatible BRK or First Alert CO and smoke detectors Light indicates if the alarm is for smoke or for carbon monoxide Single test/silence button for simple operation Hardwired combination CO and smoke alarm features battery backup for continued monitoring 20% RESTOCKING FEES AND SHIPPING WILL BE CHARGED. IF ITEM IS FUNTIONAL OR INCOMPLETE. An Important Message Regarding USPS Tracking Numbers Due to high volume of shipments sent through USPS, Tracking numbers get recycled on occasion. This means, when you receive the notificaiton that your package has been shipped via USPS, and you try to track the status of the package, it may show your package was Delivered even though the label was just generated. Please don't panic, the solution to this issue is to wait until the Post Office scans the label, then the tracking information will update accordingly. Please let us know if you have any questions. Your feedback is extremely important to us! If you are satisfied with our service please take the time to give us positive feedback. We tremendously appreciate it! We strive for your complete satisfaction. Likewise, if you have any issues, please contact us first, and we promise we will do our best to satisfy your needs and solve the problem. If we resolve your problem, we kindly ask you to still leave us positive feedback. Your kindness will be extremely appreciated!