i know i tryd googlen it to i found a site that u can buy a manual for it but its 20 bucks i payd 10 for the flasher dnt want to waste money on it if it is junk that could b gas money for an outing i havent playd with it at a lake yet i just submurded the ducer in a five gallon bucket and it showed about 1.5 ft show i think it works an goen to try and get out today and play with it more