This article is in need of a technical review.
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
devices property gives direct access to all the Bluetooth devices discovered in the area surrounding the device's adapter.
var devices = instanceOfBluetoothAdapter.devices
Not part of any specification yet. It should be discussed as part of the W3C's System Applications Working Group.