Bluetooth is necessary to pair the Sleepbuds® with your device. Once set up, it is only used to stream audio and switch soundscapes and settings. If you would like to stream audio, then yes, you need to connect to a Bluetooth device while listening. You will also need a Bluetooth-enabled device to set up the product initially. Once your Sleepbuds® are set up, you can use the Ozlo masking tracks without the device. Switching the soundscapes and settings, though, will require a connection.

No, it does not at this time.

While there is a microphone in the charging case (to assess the noise level in your sleeping environment), there is no microphone in the earbuds to support phone calls.