Sony NW-ZX2 Manual page 100

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When using inside a backpack or shoulder bag.
When using in an area with a wireless LAN, in an area where devices such as microwave
ovens, mobile phones and mobile gaming devices with a communication function are in
use nearby, or in other areas where electromagnetic waves are being emitted.
When the antenna (aerial) built into your Walkman is covered by your hand or blocked by
people in situations such as riding in a crowded train.
Because Bluetooth and wireless LAN (IEEE802.11b/g) devices use the same
frequency (2.4 GHz), signal interference may occur, resulting in communication
speed decrease, noise, or inability to connect, if Bluetooth communications are
used near a wireless LAN device. In such cases, take the following measures.
Perform Bluetooth communications at least 10 meters away from the wireless LAN device
when connecting your Walkman and a Bluetooth device.
Place your Walkman and the Bluetooth device as close together as possible.
Turn off the wireless LAN device when performing Bluetooth communications within about
10 meters of a wireless LAN device.
Due to a characteristic of Bluetooth wireless technology, the sound played on the
receiving Bluetooth device lags slightly behind the sound of the sending device.
Radio waves emitted from a Bluetooth device may affect the operation of
equipment such as electronic medical devices. Turn off your Walkman and other
Bluetooth devices in the following locations as failure to do so may cause an
accident.
In hospitals, near priority seats on trains, in airplanes, in places such as gasoline stations
where flammable gases are present, near automatic doors or fire alarms
Your Walkman supports security functions that comply with the Bluetooth standard
to provide a secure connection when Bluetooth technology is used, but security
may not be sufficient depending on the settings. Be careful when connecting using
Bluetooth technology.