Plantronics AP15 VistaPlus Audio Processor Amplifier delivers precise audio quality and is specifically designed for extremely noisy call centers. This product is designed for use with any H Series Plantronics headset. The Plantronics AP15 features multiband compression and Digital Signal Processing (DSP) technology to improve audio quality by correcting for signal loss within the bandwidth. Plantronics patented AudioIQ technology reduces noise and keeps incoming transmission at a stable and comfortable listening level. Additionally, echo cancellation and background noise reduction technology provide superior outgoing (transmit) sound.