Does anyone know the maximum and average output of electricity this device puts out while cranking?

I just measured it. At a decent cranking rate, with a load of a 5 amp/hour USB battery (intended to charge USB devices), it gives about 0.5 amps (2.5 watts), which is the maximum you get from a normal computer USB 2.0 port. If you crank really fast, it seemed to get up to about 0.6 amps. The voltage seemed to stay around 5 volts, no matter how fast you cranked, so seems to be regulated. This is a lot less than some USB charging bricks, which can deliver as much as 2.1 amps (10 watts). This also may be iffy at charging an iPad, although charging a separate USB battery and using that to charge the high current drain device may work (although my battery says 0.7 amp load maximum). The bottom line is you should expect charging rates similar to plugging your device into a computer USB port. There is crank generator device on Amazon for about $50 that claims to give 10 watts at 120 volts which you plug your AC brick into, although I don't own it so can't measure it's reality. You can instantly feel the resistance turning the crank for 2.5 watts, and turning the crank for 10 watts may take muscle and get tiring fast.

Can this be used for an IPhone 4 and the newer versions?

On the company website it says:*Please note not compatible to charge iPhone 3GS, 4, 4S, or 5. http://www.etoncorp.com/en/productdisplay/clipray-1

can this item be used to charge a hand held GPS device? i like to hunt and camp alot and im allways useing my GPS to find my car.

It has a standard UBS receptacle similar to a type 2 on a computer or laptop. I got it for charging a cell phone but I would think it should work for a GPS as well. I have tried it with my iPhone and it takes a lot of cranking to get the battery level to increase even a litttle so be aware of that. It does seem to charge but not as nearly as quick as I would have expected or desired. Hope that helps.

Manufacturer	GDM
Included Components	Charging Cable
Item Weight	4.9 Ounces
Assembly Required	No
Product Dimensions	15.24 x 3.18 x 5.72 cm; 138.91 g
Package Weight	0.17 Kilograms
Batteries Required	Yes
Batteries Included	No

ハンドクランクＬＥＤの懐中電燈を持つイートンアメリカ赤十字Ｃｌｉｐｒａｙ Ａｒｃｃｒ１００ｒ＿ｓｎｇのＵＳＢ携帯電話充電器（赤）

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ハンドクランクＬＥＤの懐中電燈を持つイートンアメリカ赤十字Ｃｌｉｐｒａｙ　Ａｒｃｃｒ１００ｒ＿ｓｎｇのＵＳＢ携帯電話充電器（赤）