Backlit....S-meter PLUS Blue with 6 leds so you can see if your mike and Power level are oke. 2 Green +1 Yellow and 3 Red leds.

Backlit S-Meter PLUS LIT Plugin.
S- Signal Strength while receiving and Audio ALC (Automatic Level Control) level while transmitting. 
It is good practice to keep the mic audio level in the green ALC area while transmitting.
P- Received Signal Strength while receiving, and transmitter power output while transmitting.