The Atmel AVR ONE! main unit comes with a probe with the following capabilities:
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10-pin connector: Target voltage range, 1.65V - 5.5V; Interface frequencies, 32 kHz - 33 MHz.
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MICTOR38 connector: Target voltage range, 1.65 - 3.6 V; AUX interface frequencies, up to 200 MHz.
An alternative probe can be purchased separately. This probe looks the same as the original probe but has the following capabilities:
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10-pin connector: Target voltage range, 1.65V - 5.5V; Interface frequencies, 32 kHz - 33 MHz.
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MICTOR38 connector: Target voltage range, 1.65 - 5.5 V; AUX interface frequencies, up to 75 MHz.
The AVR ONE! firmware will automatically detect which probe is connected and refuse to connect to a 5.5 V target through the MICTOR38 connector when using the original 3.3 V probe. It is worth noting that the JTAG 10-pin connector has the same capabilities on both probes. It is only the MICTOR38 connector that differs.