Features: 1) Monochrome 128 x 64 pixels LCD, supports all kinds of languages 2) Skype contact list, call list and time display on LCD screen 3) 12 classical 4-polyphonic ring tones catering to different tastes 4) Rings loudly on an incoming call 5) Full-function keypad and LCD of Skype contacts enables to make/receive calls without using mouse and keyboard 6) Acoustically isolated earpiece and microphone to eliminate echo 7) Supplied earphone for hands-free operation 8) Mic. mute button for privacy protection 9) Full-duplex communication with crystal clear sound 10) USB interface PnP, no external power/sound card needed 11) Handy, chic, and portable for notebook PC 12) Also compatible with other PC-based softphone applications, such as MSN, Yahoo Message, QQ, Xten, Dialpad, MediaRing, and Net2phone 13) Dimensions: 48 x 120 x 24mm 14) Weight: 90g 15) LED: power LED and status LED 16) Cabling: USB A-type and B-type connectors 17) Standard support: compliant with USB V1.1 / USB audio device class V1.0 / USB HID version 1.1 18) Earphone connector: 2.5mm 19) Operating humidity: 5-95% 20) Operating temperature: 0 - 40°C