Timer to limit tv time for kids?

[Lifelover89]

My kids have never had a tv in their room before but I have bought them once this christmas. The idea is that after I have read their bedtime story, I will put tv on in their room for 30 mins. Is there a timer or something that I can get that would automatically turn the tv off after a set amount of time? Hoping to get one and set it up from the outset so they believe it only works for 30 mins and don't expect any more! Xx

I would just use a standard plug in timer, like you'd use for a slow cooker of a light, or buy a TV which has a timer function built in.

How old are the kids though, as I think I'd rather be popping in to check on what they are watching rather than just leaving them to it for 30 minutes?