User manual SENNHEISER HDI 405 P2-120

[. . . ] Fluorescent tubes and digital controls do not use this frequency range. Lightweight and extremely comfortable to wear - the receiver weighs only 45 g, including the rechargeable accupack!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. 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!FRee lIne of SIGHt Infra-red light is transmitted in the same way as the light from a light bulb. Do not obstruct the path of the light between the transmitter and the receiver, and stay in the room where the transmission is taking place!Your Sennheiser dealer will be happy to provide you with information on binaural solutions. CHannel SelectoR SwItcH on tHe HDI 405 P2-120 the HDI 405 P2-120 stethoset receiver features a channel selector switch which lets you choose between the following options: With the switch set to position "", a stereo signal is received (channel 1 right, channel 2 left). With the switch set to position "I", only the signal from channel 1 is received (carrier frequency 2. This mono signal is supplied to both headphone systems. With the switch set to position "II", only the signal from channel 2 is received (carrier frequency 2. This mono signal is supplied to both headphone systems. CleanInG / ReplacInG tHe eaR-cuSHIonS use a damp cloth for cleaning your stethoset receiver. The ear-cushions can easily be removed from the headphones and cleaned with warm soapy water. From time to time, however, the ear-cushions should be replaced for reasons of hygiene. [. . . ] The ear-cushions can easily be removed from the headphones and cleaned with warm soapy water. From time to time, however, the ear-cushions should be replaced for reasons of hygiene. Replacement ear-cushions are available with different degrees of softness: Please order your ear-cushions from your Sennheiser dealer. enVIRonment anD HealtH Devices powered by rechargeable accupacks are kind to the environment. [. . . ]