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15
ADVANTAGES
P With cordless sound transmission, you can be independent from cab-
les!
P According to current scientific knowledge, sound transmission by infra-
red light poses no risk to health whatsoever.
P High reception reliability due to the carrier frequencies of 2.3 MHz and
2.8 MHz. Fluorescent tubes and digital controls do not use this frequency
range.
P Lightweight and extremely comfortable to wear - the receiver weighs
only 45 g, including the rechargeable accupack!
ACCUPACK OPERATION
P When the accupack becomes weak (noise interference and sound distortion
are sure signs of a weak accupack), switch off the receiver and recharge
the accupack. (If necessary, use a second accupack to listen while the first
accupack is being recharged.)
P Recharge the accupack immediately when it is flat. If the accupack is flat
but is left in the switched on receiver, this reduces the service life of the
accupack (“total discharge”).
P As far as possible, use the full capacity of an accupack before you recharge
it. Frequent short discharge and recharge cycles prematurely reduce its
charging capacity.
CHARGING THE ACCUPACKS
The stethoset receivers are powered by BA 151 accupacks which can be re-
charged either separately or in the receivers. Depending on the application,
there are different possibilities for recharging the accupacks. The BA 151
can be recharged
P in the Set 250 and Set 500 transmitters,
P in the L 151 charger (suitable for charging two individual accupacks) or
P in the L 151-10 charging unit.
For commercial use, Sennheiser offers charging and transport/storage units
for recharging a larger number of stethoset receivers at a time.
The BA 151 accupack must be charged for 24 hours before first use! Please
refer to the corresponding section in the operating manual of your infra-red
transmission system or the operating manuals for the chargers.