The test project found that can control the operation of the wireless speaker series 4 series of DTMF signal controlled by the fact that within no more than 150 meters and volume control circuitry can operate effectively.
Researchers found that test Can control the behavior of a set of wireless speakers in 4 sets by controlling the DTMF signal distance up to 150 meters and a volume control to work effectively.
The project showed that the test Can control the operation of wireless speaker series, both 4 set by controlling the signal DTMF within no more than 150 meters. Volume control circuit can work effectively.