New in box, never installed.

The Leviton 6386 is a Signal Strength Indicator designed for use with the Leviton 6385. It measures the command signal Strength at individual module locations. The minimum signal Strength required for proper DHC powerline carrier component operation is 100mV. This device is part of Leviton's decora home controls (DHC), which allows for intelligent lighting and appliance control without the need for new wiring, as it uses the existing power-line wires in your home.