Shredder

From Seerowpedia

Shredders are handheld energy weapons used by the Andalites. Due to the devotion Andalites show to their tail blades, the shredders fire their beams from tails perched on their ships. The Yeerks created a more brutal variant of these called Dracon beams. The two weapons have been compared to the phasers from Star Trek.

In The Andalite Chronicles, Elfangor said Shredders have seven different power settings. Level one delivers a mild, light charge, enough to stun an average creature for a few seconds, while level seven is poerful enough to blast a hole through two feet of solid alloy. However, that quote was from many years ago in Andalite history, and it was referring to a Yeerk model, so it is unknown how much Andalite technology, having advanced over that period of time, differs from this old Yeerk model.