Faq's, What is the range of the transmitter/receiver, Why won't the bluedriver-f3 pair with my phone – JK Audio BlueDriver-F3 User Manual
Page 18: How long will the charge on the battery last

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BlueDriver-F3
Wireless Audio Interface
FAQ's
What is the range of the
transmitter/receiver?
BlueDriver-F3 transmits and receives
audio signals up to 50 feet from your
Bluetooth wireless technology enabled
device. The maximum range of this
product is achieved when a clear
line of sight is maintained between
connected devices, but may also
be limited by interference due to
the environment. While this product
offers extended range capabilities,
maximum usable range is limited by
the weaker of the two paired/connected
devices. Transmitting signals over
longer distances will require more
power, therefore you should keep
BlueDriver-F3 as close as possible
to your Bluetooth device to conserve
battery power.
Why won't the BlueDriver-F3
pair with my phone?
If this is the first time you are trying to
pair to this cell phone, you might be
in Idle Mode instead of Pairing Mode
and your BlueDriver-F3 is not being
recognized. To reach Pairing Mode,
hold the
full 5 seconds.
How long will the charge on
the battery last?
Based on tests with BlueDriver-F3
about 1 meter from a Bluetooth
device, the battery should last for
about 10 hours under normal use. As
an indicator of low battery, the blue
LED will grow dim and then extinguish
a short while before the battery is
completely exhausted and the unit
shuts down.