2nd reply to seller: Bought as a Christmas present for our 15 year old grandson. Everything gathered, a few details soldered. My grandson has some experience with this type of work. When he tried to control the quadcopter with the controller, the controller and quadcopter would not connect. My husband, my grandfather, looked through everything, checked the soldering points, etc. and found nothing wrong with any of the components. My husband is an electrical engineer, electrician, radio amateur, he has assembled many circuit boards etc., so he is very familiar with this technology. It looks like something is wrong with one of the components. I would like a replacement or a refund, please. Thanks, Sue Pepperskpepper@att.net