Im selling my barely used reactive collision avoidance system designed for the DJI Phantom V2. It was purchased for testing of a concept. The unit itself is in perfect like new condition and includes the box and manuals. The eBumber4 works perfectly and would be great for any novice pilot to help gain confidence practicing aerial photography in an area with obstacles. Also this is a great product for a pilot of any skill level to help them protect there investment. This product is currently sold out and is not expected to be back in stock until well into the spring/summer and then only with limited availability. . DJI PHANTOM IS "NOT" INCLUDED Here are links to there website and videos, almost all your questioned can be answer by the faqs on there website. eBumper4 Asking $300 USD buyer pays shipping. I paid over $700 plus shipping from panoptes directly.