Very good question, grandparent is ... intriguing. I found a Japanese-market tv [1] but don't think it runs off 9 volts very well. [1]: https://www.amazon.co.

Very good question, grandparent is ... intriguing. I found a Japanese-market tv [1] but don't think it runs off 9 volts very well. [1]: https://www.amazon.co.jp/-/en/HT-SB115-65UB10PB-Speaker-Bluetooth-Compatible/dp/B09DPQ5YZM https://www.amazon.co.jp/-/en/HT-SB115-65UB10PB-Speaker-Blue...