Please note that this review is of the first generation Butterfly IQ which is outstanding.
But now there is the Butterfly IQ+ which has awesome upgrades including pulse-wave Doppler in the US. Here are links to three YouTube videos on the Butterfly IQ+: Butterfly iQ+: Product Overview, Review of the Butterfly iQ+ Handheld Ultrasound – Adult, and comprehensive review of Butterfly iQ+ handheld ultrasound (Dare2Compare series) with eng sub.
In this post I link to and embed interventional cardiologist Dr. Ali Haider‘s [Link is to Dr. Haider’s YouTube channel- strongly recommended], Butterfly IQ: Review of the portable handheld ultrasound, Aug 16, 2020.