I have an Aquarobo 819 S6 4.5 hour electric portable diving system. Brand new, never been in the water, only taken out of the box for photos. I had originally purchased this for gold dredging, but plans changed. Good to a max depth of 12 meters or around 40 ft, though i would probably stay above 30'. Has a maximum run time of 4 and a half hours. Simply set it in the water, turn it on, and its ready to go. Has an automatic pressure switch that turns the compressor off when not needed to extend battery life while in use. If you want to do some research on the unit, make sure you are looking at the 819 S6 4.5 as the company makes many different models.
Shipping cost will be pricey, but I have factored that into my price. The original box is big and heavy, and estimates put it around $75-$125 shipping depending on location.
Does not include the diving flag that goes on the intake tube, or the manual. Somehow, i set them down somewhere in my shop and can't find them, although they are here somewhere.
Any questions or anything just send me a message and I'll get back with you asap, thanks for looking