If for whatever reason SmartThings loses access to tethered power it can still function for 10 hours on a battery.

A full list of supported devices can be found here.

Adding extra code is as simple as copying and pasting the user submitted code. This allows for much added functionality and customization options.

When all connected devices leave the house, SmartThings automatically goes into 'away mode'. Once a device comes back in range, it will toggle to 'home mode'. You will need to configure what these modes do (whether it be locking the doors, turning the lights on/off, changing the thermostat's temperature...), but it's great that this is done automatically when you arrive home or leave.