  We present our observational results of AM CVn star CR Boo in the UBVR bands.
Our observational campaign includes data obtained over 5 nights with the
National Astronomical Observatory Rozhen, Belogradchik and the AS Vidojevica
telescopes. During the whole time of our observations the brightness of the
system varied between $13.95 - 17.23$ in B band. We report the appearance of
humps during the period of quiescence and superhumps during the active state of
the object, (where the latter are detected in two nights). We obtain the
superhumps periodicity for two nights, $P_{sh}\approx 24.76 - 24.92$ min. The
color during maximum brightness is estimated as $ - 0.107 < (B-V)_{0} < 0.257$
and the corresponding temperature is in the range as $7700 [K] < T(B-V)_{0} <
11700 [K]$. We found that CR Boo varies from bluer to redder in the nights with
outbursts activity. The star becomes bluer during the times of superhumps.
