At this price 15 or 20 m hose would not have been too much. So it's not really for tinkerers and people who have no water or electricity taken in their garden which that product is intended for: and yet it is advisable to use it only inside! If we want a battery system that's just for use outdoors, if one takes a more powerful pump that plugs into industry, manufacturers have not thought. It's a shame because it is the only product of its type on the market: all other sprinklers are either without pump or with outlet.
[Edit April 10] The seller sent me a second product, but it has exactly the same defect, the pipe is holed in one place. This is not normal, it is clearly a manufacturing defect. Here is a picture showing the problem. DO NOT BUY before confirmation that the problem was resolved. The seller is now responding to my emails, I'll have to ask my refund through Amazon.