Non

Yes

No, unfortunately it's not that high tech :)

Yes, after 20 (maybe 10, I can't remember exactly) minutes the noise stops.

I'm not sure I understand your question, but if it's a question of whether the sounds of the new Ewan will be the same as the old one, then yes, they will! All Ewans play the same sounds.

battery-operated 3 x AAA (not included) https://www.sweetdreamers.ch/shop...

The harp is a stringed instrument and, according to its tone production, a plucked instrument. Among the three basic types of stringed instruments, which are divided into harps, zithers and lutes in the Hornbostel-Sachs system according to the arrangement of the strings on the string carrier, the harp is characterised as an instrument in which the plane of the strings is perpendicular to the soundboard. The concert harp, the largest representative of its kind, is one of the largest and heaviest orchestral instruments, standing 175-190 cm tall and usually weighing 34-42 kg. - Wikipedia - Please contact the customer service directly for such enquiries.