47 CFR 95.410 - (CB Rule 10) How much power may I use?
(a) Your CB station transmitter power output must not exceed the following values under any conditions:
AM (A3) - 4 watts (carrier power) SSB - 12 watts (peak envelope power)
(b) If you need more information about the power rule, see the technical rules in subpart E of part 95.
(c) Use of a transmitter which has carrier or peak envelope power in excess of that authorized voids your authority to operate the station.