Ultimate hummer hip hop monster bundle. I ordered online on 15th nov and was told my order would not be delivered until 04 Dec, shortly after placing my order i got a call telling me that my item was out of stock and was offered to change my order if I needed it sooner, it was an Xmas present so delivery on 04 Dec was fine, and it turned up on time. We built it just before Xmas and gave it a full charge, it worked fine for an hour and then a red light came on and only one side would work, we looked online and it suggested a master reset and to recalibrate, this worked first time and it has been fine ever since. I would definatly recommend this item!