How do I maintain my A370 in the best possible condition?
Keep your training device clean. Wash the device and the silicone wristband after each training session under running water with a mild soap and water solution. Remove the device from the wristband and wash them separately. Wipe them dry with a soft towel.
Don't charge or plug in the device when its USB port is wet. Leave the port cover open for a while before charging to allow the USB port to dry up. A dry port is necessary to ensure smooth charging and syncing.
Keep the optical sensor area on the back cover scratch-free. Scratches and dirt will reduce the performance of the wrist-based heart rate measurement.