Feature and function: 1) Support SIP/IAX2 protocol 2) Large graphic LCD with blue backlight. 3) Review Skype contacts and call list on handset LCD 4) Caller ID function 5) 2.4GHz WiFi band, suitable for Europe, Japan, America and Mid-east. 6) Built-in speakerphone in base, ideal for conference call 7) Auto-selected RF channel for improved voice quality. 8) Noise reduction and digital echo cancellation. 9) Both base and handset ringing for all incoming calls. 10) Base works as charging station for handset. 11) Handfree with digital echo cancellation 12) Multi-language caller ID display feature Hardware: 1) Radio range: 50 meter (160 foot) 2) Standby time:100 hours 3) Talk time: 10 hours 4) Battery: 430mA(Li-battery) 5) USB rechargeable 6) Built-in driver and sound card System require: 1) Minimum 400mHz processor, USB version1.1 or version2.0 port 2) 128MB Ram & 15MB Disk Space 3) Internet connection (ADSL, Cable Modem, Dial-Up, Wireless LAN) 4) compatible system: windows2000 / XP / Vista / Windows 7