The GSR Temp 2X also includes a temperature sensor for monitoring heat levels in fingers. Stress also reduces blood flow to the hands, causing cooling. The GSR/Temp 2X home biofeedback system allows you to do "hand warming" biofeedback. In addition the GSR 2 monitor, the system includes a temperature sensor, remote electrodes that attach to the hands or feet, dual-sensitivity meter, earphone, instruction manual and a CD with a short relaxation program. Features: 9V battery (included). Ergonomically shaped for a most comfortable and natural grip. Provides tonal feedback through speaker or earphones. The GSR Temp 2X has a dual-sensitivity analog meter for visual feedback.