No. Ten metres is not a universal maximum for Bluetooth. Some devices are designed for short distances, while other implementations can communicate much farther.
The Bluetooth SIG explains that effective range depends on factors including radio configuration, transmitter power, receiver sensitivity, antennas and obstacles. Nordic Semiconductor reported an outdoor Bluetooth Low Energy test that maintained a connection at 1,300 metres using its long-range mode.
That test used specific hardware and outdoor conditions, so it does not promise similar performance from headphones or phones. Nordic describes ten metres as a useful indoor guide in ordinary use. A practical expectation for one setup is different from a limit applying to the whole technology.
Bluetooth has no universal 10-metre limit. Range depends on the equipment and the conditions in which it operates.
Bluetooth SIG
The Bluetooth SIG describes reliable operating distances ranging from less than a metre to more than a kilometre, depending on the implementation and environment.
Based on: Bluetooth SIG
Nordic Semiconductor
Nordic reported a connected-state range of 1,300 metres using Bluetooth Low Energy Coded PHY in its outdoor test. This demonstrates a specific implementation exceeding ten metres, not a guarantee for all Bluetooth devices.
Based on: Nordic Semiconductor
Nordic Semiconductor
Nordic describes ten metres as a useful guide for ordinary indoor use and identifies obstacles, transmitter power, receiver sensitivity and antennas as factors affecting range.
Based on: Nordic Semiconductor
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