A:AnswerHello! Thank you for taking the time to ask your question. The thermostat contains a built-in sensor, and does not require a remote sensor! - Cync Support
A:AnswerGreat question! The C-Wire is required to power the thermostat however it does include a Power Extender Kit if you do not have a C-Wire. More info can be found at cyncsupport.gelighting.com/s/article/installing-a-cync-thermostat. Feel free to contact us at 1-844-302-2943 if you have any questions. -Cync Support Team