It is indeed a 120 Vac hardwired zigbee fixture, NOT a slave.
It paired right away, using the Advanced Zigbee CT Bulb driver
Controller Type ZGB
Data
endpointId: 03
model: LIGHTIFY Under Cabinet TW
application: 01
firmwareMT: 110C-001F-01020492
softwareBuild: 01020492
manufacturer: OSRAM
It has ports to daisy-chain additional fixtures, and comes with one connector cable but it simply passes the mains through these ports UNswitched by zigbee. Any fixtures downstream are just using it for a power source.
Heh, the box references Iris and says you can pick up other sizes of this fixture at Lowes.