I’ve tried calling Leviton with no success. Is this device a z-wave repeater?
Jim,
I looked at these last week at Home Depot. I was curious so visited a few sites. This may answer your question.
https://www.smarthome.com/leviton-dzr15-1lz-dzc-z-wave-in-wall-receptacle.html
I called them and they say they don’t know. The Leviton technical data and FAQs don’t say. I have (3) of these deployed and they work well. I have a couple outside controlling holiday lights and it shows up an unavailable in the ST dashboard, yet I can still turn it on/off via the ST app.
Any certified Z wave device should have a conformance statement filed at the official zwave alliance site. In this case:
https://products.z-wavealliance.org/products/1019
That particular model is a “routing slave.“ A mains powered routing slave is a repeater. ( that’s what “routing“ means in this context.)
The Routing Slave can host a number of routes for reaching other nodes. Such routes are called “Return Routes”1. The Routing Slave can either be A/C powered or battery powered. If the Routing Slave is mains powered it is used as a repeater in the Z-Wave network. The Routing Slave functionality is used for devices that need to report unsolicited status or alarms.
You can always check technical details at the zwave alliance official site. 
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Almost all mains powered Z wave devices are repeaters. Exceptions are normally safety system devices like smoke sensors where you don’t want them to delay their primary function because they’re busy passing along a message for some other device on the network.
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