I always have it off when I'm not using the headphones :) there's a button to turn it on and off

You can also use the headphones with a headphone cable without switching them on / without connecting them (without Bluetooth). With a cable, I only use them when the battery runs out on the road (in my opinion, there is no difference in sound). However, if the question was whether there is another connection option without Bluetooth and without a headphone cable, I don't know of any.

PS: By the way, this does not apply to the Beats Studio models (over ear). Even with a headphone cable, they still need a smaller amount of battery for noise-cancelling.