How to know when my BeatsSolo 3 turns off?

Hey folks!
I just got my first wireless headphones, believe it or not, about 6 months ago. I had gotten a BeatsSolo 3 to use with my iPhone SE 3, my first device without a headphone jack. and quite liked the two together. The only problem was, I couldn't hear when the headphones turned off. It happened for a long time, that I would leave them on for long stretches of time without noticing because I had just guessed that it made the disconnection sound as it turned off, because it has to disconnect when turning off. I have some usable vision, so when I'm using the headphones and there's a space with low light available I can go in and squint to watch the light, and see when it turns off. Does anyone know of a slightly easier alternative?