@Azazel You have a neutral(white) on the other switch, you can use it if the same circuit breaker controls both switches. Else you should not steal a neutral from a different circuit.

@Azazel A dumb switch never has a Neutral(white) attached. in your case the red and white are travelers.

@Azazel You need to use the HS210 The white and red are the travelers, black is the common/load. The wire you should use as the white neutral is the two white wires under the orange wirenut.

@Teviot Remote control option was removed awhile ago. Do you have the latest App on the phone? Try deleting the App, then install using the same account info. Then reset and reconnect the LB120

@Aphelion_Blue The most simple way is to just treat the double black as 1 wire, and connect the HS200 as you normaly would.

@mylowes Using the ground as a neutral can hurt/kill someone if they remove the ground at the breaker pannel.