The EM-SMG100 Sound Masking Generator card is the *TOA ® 900 Series perfect solution for masking needs in offices or facilities where voice privacy enhancement is desired. The SMG100 generates a soft pink noise that acoustically sounds very much like air-handling ducts or vents. It can provide voice privacy at an affordable cost. high security The SMG100 card has been designed to be compatible pseudo-random with the TOA® 900 series amplifiers, or other amplifiers sequence that accept the 900 series configuration cards. This makes your installation for sound masking simple since it plugs right into one of the card slots on the back of the 900 series amplifier. simple installation The pseudo-random sequence that feeds the pink noise & affordable low-pass filter on the SMG100 card, exceeds 1.5 days in length before the sequence is repeated. This provides a realiable high security solution for your voice masking.