Kids Electric Toothbrush Recommendations Please

[Riddlediddle]

My ds (7) has shown interest in an electric toothbrush for xmas. I dont want to spend a fortune (£40 max) but wondered if anyone could recommend one from personal experience. My only request is that it can be charged up at the socket rather than battery powered.
With black friday approaching i thought now would be a good time to buy!
Thanks!

www.boots.com/oral-b/oral-b-kids?cm_mmc=bmm-buk-google-ppc--electrical_beauty--DSA%7C+OralB-_-UK_Generic_OralB+DSA&gclid=EAIaIQobChMIv_jd79yK7QIVW-ztCh3qTgorEAAYASAAEgK8bvD_BwE&gclsrc=aw.ds

Boots has them on offer - character and plain

We've got the Philips Sonicare one for kids that connects to an app. The app has a character who encourages teeth cleaning, has tips and also times the brushing with an animation guiding them round their mouth/teeth.

I know you said you wanted rechargeable rather than battery but my kids all have these. The battery lasts around a year. I think they are much better designed for small hands than the Oral B ones and much cheaper.

brushbaby.com/collections/step-3-children