To connect to a Ruby via Bluetooth, first make sure that the phone has Bluetooth enabled and the Ruby is in Bluetooth mode. The Ruby is in Bluetooth mode if the LED is blinking on and off slowly.
Then in the ruby mobile app main page, tap the large, rectangular, blue + button then the button with the label, “Bluetooth”.
Wait for the Ruby to appear in the device list and once it appears, tap on it once.
The ruby mobile app will attempt to connect and back out to the main page. If the Ruby hasn’t been connected to the mobile app in a while, there will be a prompt to sync the Ruby’s time.
Eventually there will be additional buttons such as the Real Time RMS and four informational labels about the current connected Ruby.
For details on connecting to a Ruby via USB, see Connecting to a Ruby via USB