The Pro Trinket 5V runs at 16MHz, just like the Uno. The Pro Trinket 3V runs at 12MHz, which we suggest for 'power users' who want a 3V Arduino-compatible and don't mind its a bit slower at 12MHz. | The Pro Trinket 5V runs at 16MHz, just like the Uno. The Pro Trinket 3V runs at 12MHz, which we suggest for 'power users' who want a 3V Arduino-compatible and don't mind its a bit slower at 12MHz. |