I need to change my thermostat and not sure of the colours are blue red yellow and one with no sleave

Can you restate your question more clearly? I do not understand what you want to know.

Yes, we need to know if you are talking about the wires coming from the wall out to the stat or what. This might help you https://www.askmehelpdesk.com/heating-air-conditioning/heating-cooling-maintenance-repair-troubleshooting-frequently-asked-questions-58313.html#post268211