Remote Detonator

...is a Better Than Adventure mod that provides a remote detonator that, when armed, lets you remotely ignite TNT from a distance of up to 128 blocks away. To use it, right-click on a TNT block, back up a bit, then right click again on another block to ignite the explosive.

To craft a remote detonator:

S
R
S

where S is a steel ingot and R is redstone dust.

Depends on HalpLibe to function.