The "Red Box" is a metal box that looks like a typical Thai mailbox, that the police affix to the front of your property. It contains a note book that the passing patrol signs, with the time of visit once or twice a day. Cost typically 500-1000 Bt per month. If you don't have one, the Police will likely visit offering the service. Asked nicely they might even fulfill your leather fetish: TIT afterall.
For me, the value of the service is not so much the Police visits/security themselves, but having a local contact to call when needed (e.g. like the night a gun fight broke out outside the front gate... long true story but a bit off topic, so much for quiet and peaceful Chiang Mai). Over the years, some of the "red box" BIB have become good friends and engaged in the social circle. Always useful in Thailand.