Note: Inside the package, you can find the Onelink Safe and Sound smoke / CO alarm, a mounting bracket and additional hardware, as well as a User Manual and a Quick Start Guide the product comes with a 3 year limited warranty. In order to use it properly, you will need a WiFi network, a smartphone or iPhone and the app itself which is free: from both iOS and the Android Store. The device doesn’t require batteries and it is very easy to install: you basically plug it into an outlet you will need 100 240V – most houses have this and install the app on your phone. This works on iPhones 4S or later running iOS 8+ or Android 4. 3+ phones with Bluetooth 4. 0 it’s important to have Bluetooth enabled and have a good WiFi connection before you start the configuration. It’s very important to know that the device only recognizes letters and numbers in the WiFi name and will not connect to a WiFi that has symbols?,!Make sure it’s something you will remember and if you’re not sure, just write it down. Then, the app will automatically search for your device once again, make sure that your Bluetooth is enabled and the phone is in the range of the device. You will notice that the white light on the device will shine, which means that the device and your phone are now connected. On the screen, you’ll see the “Add a new Residence” message, which means that you can give a name for your home, maybe “bedroom”, “hallway”, whatever you like and next, you will have the “WiFi setup”, which will ask you to connect it to your wireless network. Afterwards, click on your wireless name and enter the password be patient as it will take a few moments to load.