Of course your children won't ever take the Switch outside.
"We swear on the holy Zelda, Oracle Of Ages & Seasons Limited Edition!!11!"
Because they cannot...
The Switch Safe limits the console's usage to TV-mode.
You still have full access to all ports, can charge the Joy-Cons with the console, but no one (hint: children :-) can take it to friends and ruin it.
The left arm secures the Switch in the dock and an optional right one can lock the card slot.
Thanks to user Br3jlm for reporting an error in the first version I uploaded.
Fixed it (hopefully :-)
I also added a low resolution version in case your slicer can't handle the large (pretty detailed) variant.