In order to make your home smarter, you will need sensors, a hub, and maybe even an app. If you have invested in SensorPush sensors, you can use the SensorPush G1 WiFi Gateway to connect your sensors and receive alerts on your mobile device as long as you have access to an Internet service. Your data stays synced no matter which device you use to access it.
There is no limit on the number of sensors to connect. The external antenna improves your reception. You can get yours for under $100 at this time.