[Hectic]

Exactly what BioRage said. I will suggest the timer type for outdoors, and here is why. With the time type and a spoon kit you can set booby traps.
If you toss and impact outdoors and it lands on leaf litter or tallish grass or something it likely won't go off. Timer will eventually.
I will also point out that they are not all that effective outdoors for a couple reasons. Firstly they will have a hard time rotating and providing the spread we all know and love due to tall grass and thick undergrowth. They are damn handy for clearing out bunkers and such and dependant on rules and so on they could just count as a radius kill regardless of bb hits. With rules like that they are super effective.
I just wish we could get the enola gaey frags in canada that would change the whole dynamic lol