Hiro V.92 56K External USB Data/Fax/Voice Modem is Quick Connect cut the time required to connect to an ISP in half. PCM Upstream - Increase up to 30% of the Max. upload speed to 48kbps. Modem on Hold answer a new phone call up to 16 minutes. Highly compatible with various Operation Systems from dated Microsoft Window 98SE to the latest Vista 32/64 editions.