Genuine Dell plug-in Class 2 transformer, model D12-50. Input 120V 60Hz 15W, output 12V DC 500mA, center positive, small barrel plug. This is the accessory adapter Dell bundled with items like its desktop speaker sets - not a laptop charger. Works as a 12V half-amp supply for anything matching the plug and polarity. Good condition. Untested. Local pickup in Riverside, cash only.