WP-04 Pluging into your computer's USB port and connecting to PSTN line, you can make and receive Skype/PSTN calls. It's Commercial speakerphone in high grade of quality having large LCD with backlight. Phone rings for all incoming calls. You can dial Skype numbers on the phone. Key Feature: 2-in-1 telephone: VoIP(Internet Telephone) and PSTN(Normal Telephone) in one. Make or answer VoIP/PSTN calls easily by phone keypads. Multi-channel call available. Commercial grade speakerphonedeal for conference calls. LCD with backlight. PSTN and VoIP calling history reviewable. Phone rings for incoming calls, ring style and volume selectable Echo cancellation, noise reduction, full duplex communication Specification: PSTN History:Display PSTN Call List PC History: Display PC Call List Mute: USB Call Mute Function Contact: Display the contacts list Hold: Call Hold Function Del: Delete the Key Number and Call list Digital keypads: 0-9 *+ : Input "*" , #: scroll ring style or input PSTN Call: answer or make calls on PSTN PC Call: answer or make calls on Skype FLASH: PSTN Call Flash Function REDIAL: PSTN Call Redial Function Speaker: Press to active Handsfree Function Hardware: Driver and sound card built-in PSTN Line LED indicator Ports: USB port, PSTN port and Power Adaptor Jack System Requirement: 1. Windows 2000, XP or Vista 2. 400MHz processor and free USB1.1 or USB2.0 port 3. 128MB RAM and 15MB free disk space 4.Any broadband connection or minimum 33.6 Kbps dialup