Pack Of 2 Genuine STMicroelectronics  L7805CV 5 Volt 1.5 Amp Fixed Voltage Regulators.  These regulators are ideal replacements for damaged 5 volt regulators or for use in Arduino projects or your own DIY 5v regulator. Please see the typical circuit and pin out in the listing photos. I am a fully qualified Electronics engineer with over 30 years experience, so if you have any questions please ask and I will get straight back to you. Thanks for looking.