Great speaker for an older non dsp radio or mobile rig. Only thing wrong with it is I accidentally knocked my hot soldering iron into the bottom right corner. It did a little damage before I could get the iron off of it. It is only a cosmetic flaw and in no way impedes the operation of the speaker. I’ve used it until recently when I got a newer rig. It includes the power cord for use with 9-12 volts. Also has headphone jack on the side. I have ran it off a 9v battery at field day and it lasts a few hours. No manual or box. To use, hook to radio speaker port and adjust radio volume until the green light just turns green and stop. Use the speaker volume to control how loud you want it. Pushing the little button once will put into level 1 dsp, push again for level 2 and do on. There are 7 levels and the status light is orange when in dsp mode and green when in pass through mode. Cycle through the modes to get back to pass through mode. 4” speaker with 10w amplifier. Thanks for looking