Transmission/connectivity technology used and characteristics

[HenReeco]

Hi all.

I use my fitbit ionic for research purposes and I would like to investigate the energy consumption and the time needed to transmit data in different scenarios, and whether it is more useful to process some data in the device instead of transmitting. So it would be useful to know the following:

Does the device use Bluetooth Low Energy (BLE) or regular bluetooth 4.0?
I was wondering if there is a way to choose the technology, and what is the maximum transfer speed given to a custom application when transferring file from device to companion app (which mainly depends on which one of the two technologies is used).

Thanks to all who will try to help me.

[JonFitbit]

Communications uses BLE only, and the speed may vary depending upon the mobile device.

[HenReeco]

Well, there must be a maximum speed value on the fitbit device. Clearly if the mobile device creates a bottleneck, then the one of the mobile device will be the maximum speed.
I was just wondering what is the maximum available transmission frequency given to a custom application. Is there any specific restriction?

[JonFitbit · Accepted solution]

We don't artificially apply any restrictions for apps, so it's just whatever speed is negotiated between the phone and the watch.