These herb grinders are a fantastic deal at this price! The metal blades are extremely sharp and you must take care not to activate while the plastic jar is off.
WARNING: Only press the power button at the bottom of the unit after the plastic jar is secured. And remove the batteries from the unit while not in use to minimize accidents. There is no fail safe mechanism, our other electric herb grinder has a sensor where the unit only works once the jar is on and secured to the unit, this unit does not have that safety mechanism. Other than that, the unit works great! It quickly shreds anything you put in it, just don’t overfill it, otherwise the unit may temporarily jam up. This unit takes 3 AAA batteries that are NOT included.