4iiii's Viiiva Heart Rate Monitor is known for its extreme precision and reliability.

This heart rate monitor stands out by transmitting both ANT+ and Bluetooth signals, and its most unique feature is its ability to act as an ANT+ to Bluetooth bridge. In other words, this heart rate monitor can capture ANT+ signals from various sensors such as cadence meters or power meters and convert them into Bluetooth signals that can be used by other devices.

The Viiiva heart rate monitor also features internal memory for up to 65 hours of training data, allowing you to train even without a watch or bike computer nearby. The belt stores the data, which can then be transferred to your watch or bike computer when available.

Specifications and features:

• Functions as an ANT+ to Bluetooth bridge
• Adjustable strap length from 57 to 132 cm
• Weight of 47 g
• Waterproof with IPx7 rating
• Replaceable CR2032 coin cell battery
• Battery life of approximately 160 hours
• Operating temperature between 0°C to 50°C
• Operates on 2.4 GHz radio frequency and protocol