What do the different LED indicators on the extender mean?

The Power LED shows device status: solid green means powered on, solid amber means booting, and off means powered off. The Router LED indicates connection quality: solid green is best, amber is good, red is poor, and off means no connection. The Device LED shows connection to computers or mobile devices with the same color scheme. The WPS LED shows solid green when WiFi security is enabled or blinks green during a WPS connection.