Hi John,
Thank you very much the great review. We appreciate it very much as it validates our continuing efforts to source the best products for our customers and provide the best service we can. About the 2nd transmitter, I don't believe it is possible to pair two transmitters to a collar unit as they are paired in a coded manner. We do sell the handsets separately if you want one for a spare. I will reach out to you offline about this.
Wesley