SmartHeart SE102 heart rate monitor is an entry-level heart rate watch with basic heart rate measurement and calories burned features.The included chest belt transmitter is worn comfortably against the skin. The chest belt picks up the heart signals, and sends them wirelessly to the watch. The watch unit receives and shows heart rate signal. The upper and lower heart rate zone alarm can be programmed as a visual or vibrating alert. This wrist heart rate monitor features Tap on Lens (TOL) function. This fitness heart rate monitor features silent mode, key lock, buzzer (beep tone) and low battery detection. This heart rate monitor comes with an user profile.