My grandkids love this drone kit! The defenders are great and nobody had any injury problems. You can set three different speeds so even the eldest don't get bored and think this drone is for "kids". I suggest you watch the video I made on the Revain website to understand how it works. The manual wasn't very clear regarding the pairing of the drone and the remote controller. My 5 year old and 3 year old grandchildren watched along and felt at ease straight away. A 2 year old just wanted to fly on it. Children have a short attention span, so 2 batteries for 14 minutes flight time is not so little. A full charge takes about 45 minutes. My only regret is that I gave them this as a "share" toy and it didn't work. I think I'll have to invest two more, but it's not too expensive...under $30 for a toy and I have Prime for free shipping and returns. Scope of delivery: drone, controller, 2 batteries, 1 USB charging cable, 4 additional propellers, 1 screwdriver and instructions. The remote control is powered by 3 AAA batteries, which are not included. In general we are satisfied with this toy and give it 4 stars.