This is the Castle Creations PHX-Link Phoenix USB Programming kit. FEATURES: Adapter for PC Interface with Phoenix, Mamba, Barracuda, Phoenix HV and Thunderbird Brushless controllers View, change and customize program options Update ESC software via the Internet Compatible with Windows XP and Vista (32 and 64 bit) USB port required INCLUDES: One instruction sheet One USB connector One PHX link Interface REQUIRES: Internet ready PC with an available USB port SPECS: Length: PHX link: 13-1/2" 343mm USB Connecter: 71" 180cm dda 05/16/04 ir/jxs updt jxs 5/07/07