Wired as intended, this gives tremendous temperature control flexibility. It comes in a neat little box with two clever nylon panel clamps. I'm still exploring and learning with this device, and I have to say that if you're not a control engineer, the specs/instructions are a little confusing --- and I already have some electrical/electronic experience.One thing I've noted in a number of discussions that bears mentioning --- and a solution: there is no "MANUAL ON" feature, which seems to be a hold-back for some folks, and may push them to a pricier unit.[edited, more to come on project]A solution I've used is relatively simple and costs just a few bucks: put in a low-voltage DC supply, and wire in 3PDT/Center-Off mini-toggle switches so that one throw provides DC voltage to a SSR, the other throw connects the TA4's terminals to the SSR, and center is off. I also threw in three bi-color LED's (off=off; red=auto; green=manual on). And three piezo buzzers --- each with its own mini-rocker switch to enable/disable. I added another mini-rocker as a master on/off, an RJ45 Keystone jack (to remote out the TA4 signals), an AC receptacle, and another SPDT rocker to select internal/external AC receptacle. Two identical project boxes, one with the TA4, an SSR (with cut-down heat sink), and all of the switches, etc. above; and another with two SSRs/sinks, an RJ45, a split AC receptacle (each relay operates one side), and a master kill toggle with a Tineon "live" light.Whew. The control box is 7.44" X 4.44" X 2.62". Next time I'll grind the parts up and pour them in.Anyway, if you go this way, you can get three separate control channels with three SSRs: OUT1(terms. 3/4); AL1 (terms. 4/5); and another on AL2 (terms. 11/12). The warning buzzers (if armed with the rocker switches) are entirely independent of whether the TA4 terminal signals are sent to the SSRs. A channel could be turned off, but its buzzer can still be live. The Manual On position overrides, and the SSR is lit regardless of TA4 action; The Manual Off position kills the SSR, regardless of TA4 signal.The RJ45 jacks allow me to use Cat 6/5e cable to put the main relays anywhere I want, and use the local receptacle if I want the thing to go portable. So I can check the storage freezer and the BBQ and the oven, and have the thing yell at me at three separate stages. My wife wants to know when I start taking up knitting ...This unit is ideal for crazy people who like to take simple projects and keep throwing parts and features in ...I will have a few photographs in a couple of days, and a partial parts list. The decal thing didn't work for me, but the layout is intuitive enough. (I asked my wife, and she could figure it out --- and she only "speaks" on/off. ;))All of this, and I'm not even brewing. This runs three separate small fans in the bedroom --- and I get my "dual climate control" without freezing my wife.(I keep thinking of Kilmer's line in "red Planet:" "So, this is that time they told you about in high school, where algebra could save your life.")