The Switch Decoder allows up to 4 switches/buttons to be connected to one analog input (0-5V or temp). Useful when you need more digital inputs and are out of pins, or when wiring 4 steering wheel buttons through a single wire (stock horn wire for example).
 
For the full documentation about the use of this product please follow the link provided:https://www.maxxecu.com/webhelp/settings-inputs-switch_decoder.html