Once attuned, a sorcerer's rod can be summoned or banished from a pocket dimension at will.  It has three charges that automatically renew at dawn. 

The owner can use them as follows:

• With the expenditure of one charge, the owner can regain one sorcerer point.
• With the expenditure of two charges, the owner can give any allied spell caster (including himself) a +10 on a spell attack roll or a weapon attack roll that triggers a spell effect. This can be applied after an attack roll is made but before the result is announced. 
• With the expenditure of three charges, the owner can temporarily gain the use of a metamagic option he doesn’t normally have access to for one hour.

None of the charge-based options shown above require the use of an action, bonus action or reaction.   

Notes: sorcerer