It uses Low Power Bluetooth, a popular wireless protocol.
Enable bluetooth on the BodiMetrics Performance Monitor. If not done so already, enable bluetooth on the iOS/Android device and open the BodiMetrics app and follow on-screen instructions.
No. The BodiMetrics Performance Monitor can record 100 records for up to 4 distinct users. That should last most consumers 2 months of intended use. If you don’t sync it and there are too many records already, it will overwrite the oldest records. You can sync it when you get the next opportunity. Syncing allows you to review your historic data and share it with others.