Which hearing aid feature can help users connect to mobile devices?

Bluetooth connectivity is the feature that allows hearing aids to connect to mobile devices. This technology facilitates direct streaming of audio signals from smartphones, tablets, and other Bluetooth-enabled devices to the hearing aids, enhancing the user's experience by providing clearer sound and greater convenience. Through Bluetooth, users can take phone calls, listen to music, and receive notifications directly in their hearing aids without needing additional accessories.

Other features are important for different aspects of hearing aid performance but do not provide the same level of connectivity. For example, noise-cancellation technology primarily focuses on reducing background noise to improve speech clarity in various environments. Directional microphones enhance sound reception from specific directions, allowing users to focus on a conversation while minimizing surrounding sounds. Rechargeable batteries do offer the convenience of not needing to replace batteries frequently, but they do not influence connectivity with mobile devices.