The GLM User Kit from Genelec is an accessory kit designed for Genelec's SAM Monitors. It helps you calibrate the monitors to the room for the most optimal frequency and phase response. This kit includes a GLM network adapter, a calibration microphone with a holder, and a USB cable.
You'll need this kit to enable GLM software with your SAM monitors. The network adapter will connect to your computer via the USB cable. Each SAM monitor in your possession can interface with the network adapter over an Ethernet cable, which is provided with your SAM monitor (available separately).