It is likely that a Bluetooth-enabled portable music player has a maximum range around 33 feet, as of 2015. The range varies between devices and the environment in which the user plays the device.
The range of any Bluetooth portable music player depends on which class of radio the device contains. Devices with class 1 radios have ranges of up to 330 feet, class 2 operates at up to 33 feet, and class 3 devices have ranges of around 3 feet. Consumer Bluetooth devices are most likely to use class 2 radios.
Many factors can attenuate a signal's range, such as radio interference, low quality hardware or obstacles such as walls. The upper limit of a device's ideal Bluetooth range is not always attainable.