Thawing device and method thereof

The present invention relates to a method for a thawing device (TD) configured to thaw/heat a blood product comprised in a container (B), the method comprising the steps of performing (510) a massaging motion, by a first actuator (M1), on one or more areas of an outer surface of the container (B), obtaining (520) measurements, from a reflectance sensor (R) coupled to an antenna (ANT), the measurements at least being indicative of phase (φ) of received radio frequency, RF, waves having a second frequency (f2) and being reflected off the container (B), determining (530) a third frequency (f3), wherein the third frequency (f3) is determined by a predetermined relation dependent on the second frequency (f2) and the obtained measurements, controlling (540) a transmitter (TX), communicatively coupled to the antenna (ANT), to emit RF waves, using the obtained measurements, wherein the emitted RF waves are emitted at a third frequency (f3) and are directed by the antenna (ANT) to propagate towards the container (B), wherein the third frequency (f3) is in the range of 10 to 900 MHz.