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Hong Kong SAR Accutone Technologies Ltd has developed the A30, a phone headset amplifier designed for use in call centers. The model's voice enhancement technology suppresses background noise in a signal to play up the voice band. It is compatible with most analog and digital system phones.
With its built-in battery, the A30 supports up to six months of continual operation and up to 2yr standby time. It also supports easy switching from headset to handset.