SMART Technologies 240 Benutzerhandbuch

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99-00855-20 C0

There are transmitters on the microphones that transmit an infrared signal. To ensure optimal 
performance, don’t cover or block the infrared transmitters. There must be a clear line of sight 
between the microphones and the infrared sensor in order for the audio system to work 
properly. 

If you use the included rechargeable batteries, you can 
recharge the microphones by connecting a microphone charger 
when the battery indicator light changes from green to red.

Fully charged batteries last approximately eight hours in the 
teacher microphone. For the handheld student microphone, 
fully charged batteries last approximately six hours when you 
set it to High and approximately nine and a half hours when you 
set it to Low. It takes approximately eight hours to fully recharge 
the batteries.

Infrared sensors detect microphone signals and send them to 
the receiver. You can use either the infrared sensor on the 
front of the receiver or the infrared sensor for the ceiling. 
Ensure that there is a clear line of sight between the infrared 
sensor and the infrared transmitter on the microphones.

Your SMART Audio system comes with four wall or ceiling 
speakers. The speakers mute if the signal from the 
microphones is blocked or weak. This prevents unwanted 
static and noise from occurring.