This listing is for a handmade clip-in solution for adding voltage to instruments or pedals, increasing the voltage from 9v to 24 volts. Primarily used with active pickups (EMG, Blackouts, Fokins, etc.), but may potentially be used with guitar pedals ( At your own risk). Batteries not included, Check your equipment manufacturer's specs before use, and message if you have questions!

For reference: 

EMG Max voltage:27V

Blackouts Max Voltage:27V