: not prepared ahead of time : made or done without preparation. 1  Two of my friends came by unexpectedly, and we had an impromptu little party in my kitchen. 2  He made an impromptu speech about honor and responsibility.
Go to the existing phone jack and unscrew the cover of the jack with the screwdriver. Locate the four wires and attach each wire to its matching color. Go to the location of the new phone jack. Attach the telephone wire to the terminals inside the phone jack. They are named red, green, yellow, and black.
However, your thermostat wire colors may be different than what is indicated here. There is no official standard for thermostat wire colors. You can consider this the standard wiring colors for thermostat and HVAC equipment. Standards for thermostat wiring colors do not exist except for here and a few other references on the internet. However, these are the most common wiring methods used.