My only concern is the 'yellow wire'.....suitable for inside of walls?? Looks like yellow zip cord to me, & no info via the pages in the link.
John here is some info I found on the site.
All wire is not created equal! Our custom manufactured wire is designed to work with all components of the system. Its insulation and internal threading is specifically engineered to work with our mounting clip and wire lock assembly. Use of any other wire may cause poor contact, and malfunctions in the system, and voids our UL/CSA approvals.
Wire is sold in a 500 foot pull box. It is run from the individual candles in a 'daisy chain' or in straight runs to the central power supply. It is not recommended to have more than 6 candles per run, to assure consistent brightness of all candles.
As Bob said, you must use the manufactures wire and install it as per the manufacture instructions. This is something totally new, and I have never seen it before. I thought that everyone else out there might like to see something new. You now can have "holiday" candles up all year round, using low voltage, and still meet the NEC.