Key Features USB 2.0 compatible Built-in 16-bit sound card Built-in ringer softphone volume adjustment open SDK code, easy to devolope for dedicate application System Requirement Pentium 400MHz or equivalent Windows 2000 or XP 128M RAM Regulatory Compliance FCC part 15, CE class B Packing: Inner box MEAS 155?31?10mm G.W./unit 0.2kg Carton MEAS 410?23?68mm G.W. 8.7kg PCS/CTN 40pcs