I use this one
https://www.amazon.co.uk/Portable-Wireless-Rechargeable-Temperature-Lullabies/dp/B09Q3CW7DV/ref=asc_df_B09Q3CW7DV/?tag=googshopuk-21&linkCode=df0&hvadid=696285193871&hvpos=&hvnetw=g&hvrand=2167329151665579665&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9044936&hvtargid=pla-2281435179298&psc=1&mcid=cb81442e29de3aae8e2c55acfe8447fd&hvocijid=2167329151665579665-B09Q3CW7DV-&hvexpln=74&gad_source=1
It's very basic and doesn't use the WiFi which is what I wanted..works well.
There are lots of fancy expensive ones on the market too if you want to splash out
I use this one https://www.amazon.co.uk/Portable-Wireless-Rechargeable-Temperature-Lullabies/dp/B09Q3CW7DV/ref=asc_df_B09Q3CW7DV/?tag=googshopuk-21&linkCode=df0&hvadid=696285193871&hvpos=&hvnetw=g&hvrand=2167329151665579665&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9044936&hvtargid=pla-2281435179298&psc=1&mcid=cb81442e29de3aae8e2c55acfe8447fd&hvocijid=2167329151665579665-B09Q3CW7DV-&hvexpln=74&gad_source=1 It's very basic and doesn't use the WiFi which is what I wanted..works well. There are lots of fancy expensive ones on the market too if you want to splash out