You begin gaining the skills required to safely utilise your bells. You gain access to bells as shown in the bandolier table.

As an action you may unholster a single bell and sound it producing one of the effects listed on the bandolier table. Should a bell be used by someone who is not the Abhorsen the effect of the bell also affects the user.

Whilst wielding one of the 7 bells you are considered as having the spell associated with that bell prepared and it does not count against your number of spells known. 

Using a Bell:

A spell slot is not required to use one of the bells and material components are not needed. However a performance check is required to establish the Abhorsen's effectiveness with the implement. When making a performance check, every 2 higher than the performance DC equates to a 1 level higher spell slot. You may use the bells a number of times equal to your your charisma modifier. You regain all uses of your bells after completing a long rest. 

Bandolier