Need to get wired

I want to wear a wire to grab evidence of my noisy neighbor. My useless landlord refuses to do anything about it and just referred me to the cops who probably won't do shit either so I wanna document every minute and every interaction I have with the dumbass.

Anyone recommend a specific wire? Are they all remote or do some have storage capabilities? The USB audio recorder I grabbed from ebay is a crappy one that records 4-bit WAVs and the timestamp keeps being reset. The timestamp is important.

A sensitive one I could place outside my window or outside his without him noticing would be great, especially one that can wirelessly transmit and which I don't need to recharge every hour.

Thanks.