Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: UPDATE

I must update my previous review with new info.First, I ripped open the second receiver and could find no reason to mount it vertically except for the ferite antenna which is mounted horizontally in the box, Radio range may be to only reason that they said it must be mounted vertically. I found no internal device that would cause problems if mounted differently than they recommend. But I'd rather hear that from the manufacturer, yes?Secondly, the second transmitter DID NOT WORK WITH THE FIRST RECEIVER!So, they must have different frequencies available, albiet unpublished.An early poster stated that both of his were on the same frequency. My two are different.So pay your money and take your chances, yes?