Dura Stick Premium Electrodes 2 Round Cs 40 Jobst Opaque 20 30 Thigh High * The large easy to read LCD Color:Yellow * The large easy to read LCD along with our heart rate graph bar and muscle activation figure give you the feedback to keep you going through every workout Automatic age based target zone : bpm % * To help you train safely and effectively the training computer determines your heart rate target zone limits automatically according to your age based maximum heart rate (220 minus age) Self Adhesive * 10 packs of 4 each 40 case * Pure conductive silver layer * Stainless steel mesh and blue gel * Choice wire and molded connectors * Provides optimal current dispersion with low impedance