The listing, Radio Shack 7.5 volt, 500mA AC Adapter has ended.
Radio shack 7.5 Volt, 500 mA AC adapter.
120 volts AC 7 watt to 7.5 volts DC at 500 mA.
Cat. No. 273-1764, cut wires, no 2 pin adapter on the end.
I bought it for a battery operated CD-ROM drive in the olden days. Note a AA battery has a rating of 1800 mAh, and a AAA battery 1000mAH.