Provides color display when connected to J179 and grayscale display when connected to J169 Brightness is adjustable from the connected base IP phone Up to three JEM24s can be connected to an Avaya J169 or J179 IP phone Power is supplied by base IP phone (increases PoE to class 2) External 5V power supply is required if adding two or more JEM24 Compatible with Avaya J169 and J179 IP phones No additional licensing is required when adding the Avaya JEM24 button module