Title: Don't buy it
Review: I ordered two units - they were inexpensive enough and other reviews gave me the gut call that it might just take two to result in one functional set. And that turned out to be the case. One set (sensor plus receiver) appears to work just fine. The other set came without all the parts. Plain as day, the battery connections are simply not installed. Humorously, the "Q.C. Passed" inspection sticker is stuck right where the contacts should be! Blind inspector, maybe?? So - I now have one receiver and two sensors, which I can get by with -- 'cause at $13 a pop, it's not worth the time to return.
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