Old Vintage Casio TV-600 U. A vintage handheld analogue tv from the (I’m guessing) 1980s/90s? Switches on and screen lights up but obviously no picture as it is analogue. Battery operated, there is a socket for an adapter but no lead or batteries are present or included. Bit dusty and there appears to be dust inside the screen (see photos). I will leave feedback once you are happy with your item and have left feedback.
eBay