Sure thing. If you have an ecobee, the package contains a Power Extender Kit (PEK), which is what you’ll use to power your thermostat. For more details, refer to step 3 of the Installation Guide inside the box.
If you have a Smart Si, you’ll need to repurpose your G wire as the C-wire. More details are available here.
Check whether your home is compatible with ecobee here.
If you require assistance, check out our installation videos.