If you're seeing a weak Bluetooth signal in the Eko App after you've successfully connected the DUO, try these steps:
Check to see if you have any other Bluetooth devices connected to your mobile device.
Make sure that there is a clear line of sight between the DUO and your phone.
Maintain a close proximity of the DUO and the Eko App (within 5 feet) to ensure a good Bluetooth connection.
Make sure that you're not near any other Bluetooth peripherals as that can affect the Bluetooth signal quality.
If you're still experiencing a weak Bluetooth signal, please submit a ticket here.