If a device is discoverable, it will respond to the discovery request by sharing some information, such as the device name, class, and its unique MAC address.

如果一个设备是可被检测的，它将通过分享一些数据来相应检测请求，例如设备名称，类，以及他的唯一的MAC地址。

youdao

The thing is that this can only be done when your Bluetooth is on AND your device is set to discoverable mode, though there are two Nokia handsets (the 6310 and 8910) which are vulnerable even when they are not in discoverable mode, and if you have one of these you need to get a firmware upgrade to prevent the attack.

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