I wanted to brag on the SNZB-01P. I love those wireless buttons. They are great. Little shaky at first, but they did a firmware update and made them 100% reliable.
I use them both with Smart Scenes and Alexa Routines. I also use the Flic 2 buttons, but they cost more than 2.5 times the price of the SNZB-01P.
Yes, you need the ZBBridge or Pro. But they are worthwhile. Try them. Hide them in places where you need to run something. You can stack Sonoff on/offs in Smart Scenes and excute all kinds of things in an Alexa routine. LOVE THEM.