I looked at this a while back, my concerns where, you need to have it plugged in (so trailing a lead) as the batteries where rubbish, on the ones I looked at & if it has dead batteries, it not going to be used…
Ended up with a cheap and cheerful Sandstrom one from PC world and it does the job, though have to admit I’ve never go round to turning all the pictures the right way up, as you have to use the devices settings & not just alter the pictures on the PC.
Ours is still turned on regularly (not just by me) even almost 12 months later, but we broke the stand/foot some many times, it’s now been lost & so has to be propped up.