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We present observations (with NAO Rozhen and AS Vidojevica telescopes) of theAM Canum Venaticorum (AM CVn) type binary star CR Bootis (CR Boo) in the UBVbands. The data were obtained in two nights in July 2019, when the V bandbrightness was in the range of 16.1-17.0 mag. In both nights, a variability fora period of $25 (\pm 1)$ min and amplitude of about 0.2 magnitudes was visible.These brightness variations are most likely indications of "humps". During ourobservational time, they appear for a period similar to the CR Boo orbitalperiod. A possible reason of their origin is the phase rotation of the brightspot, placed in the contact point of the infalling matter and the outer discedge. We estimated some of the parameters of the binary system, on the base ofthe observational data.

Mid-Cycle Observations of CR Boo and Estimation of the System's Parameters