Editorial Product Review:Item Description:Honeywell model C7189U1005 White Indoor Remote Temperature Sensor For Th7000 And Th8000 Series Thermostats. Allows for controlling temperature in one room (where this sensor is located) from another room where the thermostat is located.
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Buyer Reviews
Average Buyer Rating:
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Exactly what I wanted
Bill Henry is correct! This is not the right picture but the description is correct and is exactly what I needed. I think the picture is of the "junction box" that goes with the C7189U if you want to have 4 or 8 remote temperature sensors to use temperature averaging throughtout your house. The RTS is small as it should be, 1 1/2" wide, 2 1/4" tall and 3/4" deep, almost invisible on a white wall.
It works great and solved my problem without having to move the thermostat to where I installed the RTS.
This was the 2nd time I ordered from Plumbing Planet and again they were great. When I ordered it, the "quantity in stock" said "1" which worried me a little. But I ordered it late Friday afternoon and it was at my front door the following Tuesday using UPS Standard.
Customer Rating: 
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Honeywell Remote Indoor Sensor C7189U1005
1. The image you show for the C7189U1005 is not correct. Plumbing Planet where I purchused unit has informed you of my concerns. I purchesed two units on e-bay and they have the image you show and on the inside, there is a label showing unit is a C718U1005, which is required for use with HONEYWELL TH8500 Series Thermostat. This unit is well constructed and is designed to fit an AC standard outlet; however, the unit I received when ordering from Plumbing is a Honeywell C718U1005 as shown on Honeywell web page. This unit is not equal to the two units I received from ebay.
2. Plumbing Plant has been great and were willing to have unit returned.
3. Honeywell Customer Care told me that they were not aware of any change in their unit.
4. The unit received, C7189U1005 is very fragile, very small, has a cover which is not secure on base, is not designed to fit over an AC standard outlet, and mounts on wall with screws and plastic inserts.
5. Users manual is confusing. English pages do not go in sequence. Does not specify that remote sensors have to be installed as 1, 4, 9, etc. This cause me and the air conditioning technician much wasted time trouble shooting since I was trying to install 2 sensors. Honeywell Customer Care did clear up the problem. The manual does show diagrams as to how the units can be wired but does not specify that the installation must be as shown.
Customer Rating: 
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Inexpensive remote sensor but be cautious
These little guys are cheap and work great. The literature, however, is unclear on how to use them. When using one, the sensor in the thermostat is disabled, so you have only the one sensor. If you wish to use more than one, you cannot use two...or three, you must use 4.