4iiii Innovations V100 viiiiva Heart Rate Monitor V100 Advanced, beat-to-beat measurement makes Viiiiva ten times more sensitive than most heart rate monitors to capture the most sensitive of heart rates, measure heart rate variability, and gauge your level of activity readiness ANT+ sensor bridge lets Viiiiva collect data from other ANT+ sensors, then transfer it via Bluetooth to your iOS or Android smartphone Tap-to-pair connection lets you simply tap your iOS or Android smartphone to your Viiiiva pod to immediately connect the devices Display compatibility gives you the freedom to use your choice of ANT+ and Bluetooth compatible displays with Viiiiva Long battery life Viiiiva comes with a replaceable coin cell battery that gives you up to 200 hours of usage