HELIX12 CHIRP SIGPS Humminbird HONDEX GARMIN

This was a gift from an acquaintance.
They apparently used it with care, but I received it as they retired. I have no use for it myself, so I am listing it for sale.
Water depth, water temperature, and GPS are currently confirmed to be functioning.
It supports side view.
The transducer confirmed functionality for 175-225kHz and 455kHz/800kHz directly below.
The transducer is also making a good crackle sound.
The clip on the rear connection terminal in the 7th photo is worn, making it easier to detach, but it should not come off unless pulled strongly.
GPS is also receiving and confirming the current location without issue.
The photos are in demo mode.
It should be fine if you plan to fix it to a boat.
There are no other particular concerns.
There is an occasional rattling sound near the terminal, as if something has fallen inside? However, the sound stops when it is tightened properly. It is unclear if this is a feature, as it is an overseas product.