Devilsaur Eye

Devilsaur Eye is a trinket exclusively for hunters that increases (ranged) attack power and chance to hit for a limited time.

Source
Devilsaur Eye is a quest reward from the quest which starts with Ogtinc in Azshara. To complete the quest, you must turn the following item to Ogtinc:
 * 1 Tooth of Morphaz

Effective Attack Power
Assuming this trinket were activated every cooldown, it would provide an effective: 150 * 20 / 120 = 150 * 1 / 6 = 150 / 6 = 25 Attack Power