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[. . . ] VARIANTS RI 150 Infra-red mono stethoset receiver, designed for use as a personal sound amplifier for people with impaired hearing. It can also be used as an additional receiver for the Set 150 infra-red mono transmission system. RI 300 Infra-red stereo stethoset receiver, designed for use as a personal sound amplifier. [. . . ] Make sure that you wear the stethoset receiver the right way round, with the "Sennheiser" logo at the front. There is a simple rule: If you can see the transmitter or the infra-red radiator from where you are, transmission can take place without any interference. When people use headphones, they tend to choose a higher volume than with loudspeakers. Listening at high volume levels for long periods can lead to permanent hearing defects. Please protect your hearing, Sennheiser headphones have an excellent sound quality even at low volumes. ACCUPACK OPERATION 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. ) 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"). 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 recharged either separately or in the receivers. depending on the application , there are different possibilities for recharging the accupacks. The BA 151 can be recharged in the Set 150 and Set 300 transmitters, in the L 151-2 charger (suitable for charging two individual accupacks) or 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! [. . . ] TECHNICAL DATA Modulation Carrier frequencies AF frequency response THD Signal-to-noise ratio Operating time with one accupack Weight with / without accupack Max. Sound pressure level SENNHEISER TECHNOLOGY AND SENNHEISER SERVICE ARE FUTURE-ORIENTED Even after many years, you will still have unlimited pleasure from your infrared sound transmission system. You can buy replacements for wearing parts such as ear-cushions and accupacks for many years to come. [. . . ]
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