I am currently looking into portable ultrasound transducers for education purposes. It is mainly used to demonstrate how an ultrasound transducer works. It would be appreciated if you could educate me if DeepLight meets my needs.rnrn1.What are the maintenance/ accessories needed for this scanner?rn2. It can be operated using the App in ISO and Android, is there any membership fee required to use the function?rn3. How much would 1 unit cost?