Old Lowrance Flasher
I have a generic manual that I received from Lowrance several years ago. It is not specifically for that unit, but they said that the manual will general tell you how to operate it. It can be found at http://www.mediafire.com/view/x1nbj66m47h6bls/Lowrance_Sonar_Flashers.pdf
If you can't access it through the link, please turn on your Messenger and I can send it to you.
Good Luck, CheapTrix
(edit) I had one - gave it to a LL'er several years ago for free. They work but best suited for setting large baits - like tip-up minnows - without using that weight.