https://www.amazon.com/Z-Wave-Module-ZEN07-Cert-ZC10-16085170/dp/B01M1MA5CO/ref=sr_1_38?ie=UTF8&qid=1478481746&sr=8-38&keywords=z+wave
Works out of the box with Indigo 6.1.11 (Just saw 7 was released!). This outlet is smallest surface mounted I have seen and is Z-Wave Plus. Has numerous advanced features built in. Log below.
Z-Wave Syncing - assigning return route to "089 - Relay Power Switch"
Z-Wave Syncing - assigned return route
Z-Wave Syncing - retrieved manufacture and model names: Unknown - 027A, Relay Power Switch - 00030087
Z-Wave Syncing - retrieved protocol version 4.05, app version 3.81
Z-Wave Syncing - retrieved class hierarchy: Routing Slave : Relay Switch : Relay Power Switch (04 : 10 : 01, base 25)
Z-Wave Syncing - retrieved command classes: 20v1 85v1 86v1 27v1 72v1 70v1 71v1 32v4 73v1 59v1 5Av1 5Ev1 25v1
Z-Wave Syncing - retrieved group 1 associations: []
Z-Wave Syncing - retrieved group 2 associations: []
Z-Wave Syncing - retrieved group 3 associations: []
Z-Wave Syncing - added group 1 association to interface
Z-Wave Syncing - created device "089 - Relay Power Switch"
Z-Wave Syncing - complete
Z-Wave sent "089 - Relay Power Switch" status request
Z-Wave sent "089 - Relay Power Switch" energy status request