The GD007 USB Cordless Skype Phone solution directly supports Skype which controlled on PC side and can switch between with traditional PSTN phones ,It supports all kinds of analog telephone devices and analog PBX system ,it is plugged into just like general PSTN calling application and only used a button to switch skype to VOIP function . The farthest distance against its power of our vendor could take off is about 300 meter . It is the ideal selection for our vendor's conference or being off their office .