This might help:
Sylvania/Osram has a battery powered switch device which is popular and can work in one of three different ways with SmartThings depending on the device type handler would you choose. It’s important to understand the differences, because this will cause the device to work in very different ways.
The Device
This FAQ applies only to the Sylvania “dimming switch” model 73743. It does not apply to any of the other Sylvania switches, battery powered or not.
( please don’t ask questions about other models in this FAQ thread – – look for the other device threads under devices and integrations.)
This device can be used on a tabletop or on the wall, although it’s pretty big on the wall. But it will fit over the top of an existing switch, which makes it an excellent choice for when you want to…
To use the particular DTH you chose, you have to individually bind the lights to the dimmer, which may not be possible with those models. They also have to be within 1 hop of each other.