Can some one explain how this 6P replacement works

http://www.supertactical.com/unlimitshop/product_info.php?cPath=26&products_id=68


"Cree 7090 XR-E Q4-WB BIN LED with a life of 50,000 hours.
FIVE mode output:

1)200 lumens
2)70 lumens
3)40 lumens
4)STROBE
5)SOS
Digital control.
Use Light Orange Peel aluminum reflector.
Input power:3.0V-4.2V(1XCR123, 1X16340, 1X17670 or 1X18650)
Use one 17670,18650 rechargeable battery for extra long runtime.
Fit for Surefire 6P,G2,C2(no gap) & G&P , Ultrafire ....."

It has multiple settings, so how do you access those setting with a standard push button tail cap? I have a cree 3w replacement now and like it but this one seems pretty cool

Thanks

It probably changes modes with a short disconnection in the circuit's power, so:

On-Off-On quickly will change the modes(Doesn't have to be a "click" on, as long as there's current flowing through the driver).

okay, that makes sense. thanks