The 4iiii Viiiiva is a versatile heart rate monitor favored by top cycling teams like Jumbo Visma. It can store up to 65 hours of workout data, ensuring your data is safe during key training sessions. Beyond monitoring heart rate, the Viiiiva functions as an ANT+-to-Bluetooth bridge, allowing you to connect ANT+ devices to Bluetooth-only receivers like smartphones, tablets, or laptops. This feature enables seamless integration with popular training software such as Zwift, TrainerRoad, TheSufferFest, Rouvy, and more.