The new Claro smart accessory switch allows you to expand the use of your existing Diva smart dimmer switch for Casta smart lighting (DVRF-6L-WH-R, sold separately) and its advanced LED+ dimming technology to create 3 way and multi-location applications. Control one light from two locations using the dimmer (sold separately) to dim and the accessory switch for on/off switching control. Add up to 10 accessory switches to control in a multi location application. Tap the switch once for your favorite light level, set by your Diva smart dimmer, and twice for full brightness. The smooth fade on and fade off allows your eyes to adjust comfortably to your determined light level; push and hold for 30 second delayed fade-to-off. No neutral required, wallplate sold separately.