Assertion: headphone's range | /r/HasProperty | extended to 1.78 km
Facets:
value: with directional antennas and signal amplifiers
type: OTHER
Source sentences:
text: In August 2004, a world-record-setting experiment (see also Bluetooth sniping) showed that the range of Class 2 Bluetooth radios could be extended to 1.78 km (1.11 mi) with directional antennas and signal amplifiers.