There are LEDs that light up on the UBlocker and also on the Phone Adapter.
UBlocker WIFI -- The LED on the circuit board will usually show in GREEN when the unit is in idle mode (e.g. ready to block calls).
UBlocker LAN -- The LED on the circuit board will usually show in RED when the unit is in idle mode (e.g. ready to block calls). There are 2 LEDs on the Ethernet port. The one on the left side should be GREEN (power) and the other should be GREEN or AMBER (activity) in idle mode.
Telephone Adapter -- The LED on the Telephone adapter should be RED in idle mode.