I have installed HS210 in a couple locations where there wiring was a typical 3-way circuit with the source wires coming to the switch from the breaker with the switch being in the middle of the circuit. No problems.

I want to put a 210 in my garage stairs with a switch on the top and the bottom. The source comes into the j-box at the top of the stairs. There's a 3-wire romex going to the downstairs switch and a 2-wire romex to the light. It is exactly like Option 9 in the link below.

easy-do-it-yourself-home-improvements dot com/3-way-switch-wiring-diagram dot html

In this setup, I'm thinking my neutral is the capped black lines coming from the source. Am I thinking about that correctly?

Thanks in advance for any assistance!

No Par King