After two uses I have to redeem propellers which is apparently not easy. Fortunately I discovered when looking around the propellers of hubsan Q4 or H111 are the same. (Be careful not the X4 which is bigger)
Basically it is a quadcopter to buy with a dozen additional propellers games to be really usable. Apart from that it works great indoors, makes relatively little noise and is very handy. It recalibrates easily too.