Features: 1) Seamlessly integrated with Skype, VoipBuster, VoipStunt, VoipCheap, Voip Discount, SparVoip, Internetcalls, and NetAppel 2) Use of Skype with DECT phones or other regular phones 3) Upgrade your regular phone set to be a PSTN/VoIP Dual mode phone 4) The standby mode is on PSTN channel (it is necessary for emergency calls such as 911) 5) Call alert for PSTN incoming call when you are on a Skype call 6) Call hold allows you to handle VoIP and PSTN at the same time 7) Speed-dial up to 99 contacts 8) FSK caller ID 9) An instant message is sent to the Skype caller when you are unavailable 10) Live update the driver automatically 11) Compact and delicate design 12) Seamless integration with Skype 13) Fully functional FXS port 14) Echo cancellation technology ensures smooth and clear sound 15) USB interface PnP. no external power / sound card needed Specifications: 1) Weight: 95g 2) Dimensions: 75 x 100 x 21mm 3) Telephone interface one FXS port and one PSTN port for pass-thru 4) LED VoIP indicator and power indicator 5) Voltage: 4 - 5.25V 6) Operating humidity: 5 - 95% RH 7) Operating temperature: 0 - 40°C 8) Standard support compliant with USB V 1.1 9) Compliant with USB audio device class spec V 1.0 10) Compliant with USB HID version 1.1 System requirements: 1) Pentium 400 HMZ or above, with 128MB RAM 2) Windows 2000 / XP 3) Skype version 1.2 or higher must be installed 4) DECT phone or other analog phone 5) LAN / ADSL / 33.6k modem or faster Internet connections Inner packing: Gift box dimensions: 150 x 110 x 30mm Outer packing: Carton dimensions: 43 x 26 x 17cm N.W.: 5.5kg G.W.: 6.0kg Conveyance: Qty/20\'\' FCL: 24pcs