Bluetooth in its current form is already the result of many years of improvement. Since it already operates wirelessly, some potential ideas to improve its functionality would be to increase the sensitivity of the receivers to enable reception of higher frequency signals, which could help to improve transmission speeds and reduce latency at a potential cost to range. Additionally, software could be used to aid in the encryption of Bluetooth transmission. Two-factor authentication is already widely used when connecting to Bluetooth, as many devices will display a pairing code that you have to confirm prior to making an initial connection.
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