Features: 1) Low noise, digital tone, and exceed long distance 2) SW-2430 is strong telephone keyboard to receive & dial out callconveniently 3) Dial hand-free,LCD glass screen night light function 4) Call ID function when call coming 5) Automatic shake-ring when skype call coming 6) Adjust the coming call shake volume independently 7) Supports Skype contact person list at the computer screen, browser up and down via handset 8) Accord with G.165 16ms echo counteract, provide the correspond tone of traditional telephone, more clear talk 9) Dynamic voice inspect; comfortable yawp make; dynamic voice amortizetechnology 10) Dial directly contact person speed-dial number via head-phone, or dialskype out charge-save system Specifications: 1) Dimensions: a) Base phone: 108 x 95 x 72mm (L x W x H) b) Hand phone: 127 x 45 x 27mm (L x W x H) 2) Weight: 180g 3) Physical connectors one USB port 4) Cabling USB B-type connector 5) Standard support compliant with USB 2.0 full speed operation 6) Compliant with USB audio device class spec V 1.0 7) Compliant with USB HID version 1.1 8) Operating humidity: 10% - 90% RH 9) Operating temperature: 0 - 50 Celsius 10) Sampling rate 48k/44.1kHz for both playback and recording System requirements: 1) Windows 2000 / XP operation system 2) Exceed 400MHz CPU 3) Exceed 128 MB main memory capacity 4) 10MB hard-disk space 5) Connect to internet (dial to internet: the minimum 33.6 kbps modern, or other kinds of frequency band: cable, ADSL ect ) 6) One USB port available Outer packing: N.W.: 5.9kg G.W.: 6.9kg Conveyance: Qty/20\'\' FCL: 20pcs