To avoid any BS allegations.

I've been using my phones microphone with a button shortcut ever time it looks like things are about to get sexy with a girl. While fucking I'll speak dirty, and in ways where she keeps verbally consenting (you like that? You want this dick?). From a phone pocket in the same room, it picks everything up decently.

I'm sure I am not the only einstein to think of this, who else does this?

But I am considering getting another device for it, a discreet microphone or camera. My phones battery drains, it gets too hot, and it uses up a lot of data since I don't stop the recording sometimes all night.

Are there any good discrete pocket mics dudes use for this? Something that can just run for hours, timestamps stuff etc

Before anyone asks, I don't want to make discrete sex tapes or anything. Just something that can stay in my pants pocket and record everything.