Did I get sent the wrong board? Is this pro micro 3.3v or 5v?

Development Tools IDE 1.x
2

Upadate.

To test the clock speed I tested the board with this code

void setup() {   
    pinMode(17, OUTPUT); 
}  


void loop() {   
    digitalWrite(17, HIGH);   
    delay(10000);   
    digitalWrite(17, LOW);   
    delay(10000); }

And flashed it as 5v/16Mhz Pro Micro. It actually worked with the correct timing. Now I am even more confused. Is this board actually working at 16Mhz with a 3.3Vcc? isn't that adviced agaisnt in the ATmel 32U4 Data sheet?