Aiming for marathon success The marathon function of ONYX Pro enables a runner to accurately check and evaluate the heart rate and split times during a marathon. ONYX Heart Rate Monitor - What's new? the digitally coded range from Sigma Sport® DIGICODE – Interference-free transmission! All models with digicode feature digitally coded transmission.		ONYX Heart Rate Monitor - What's new? From the Entry Model to the Pro Version – ONYX the digitally coded range from Sigma Sport® INTUITIVE MENU NAVIGATION Easy handling by means of a menu. Pressing one of the top two buttons brings up the menu with the function of both buttons. (same operating principle on all ONYX models)   VERSATILE TRAINING PROGRAMMES A wide variety of training programmes were developed through collaboration with Freiburg University (Germany), specifying the duration and intensity of the training session. Up to 4 types of stamina training, 3 interval types, plus marathon and lap training are included depending on the ONYX model. In addition, each heart rate computer is equipped with a freely programmable training mode.   TRAINING BASED ON MAX HR OR IAT (ONYX PRO) You can choose between calculating the training zones based on MAX HR or IAT (individual anaerobic threshold). The very precise IAT setting requires a lactate test, which can be done at the doctor's or your gym.   DIGITALLY CODED TRANSMISSION On all ONYX models, the new chest belt transmits coded data packages to the receiver in the watch. Disruption to training in a group is no longer possible.