It is a bundle of VIFLY Strobe and VIFLY Beacon. VIFLY Strobe is drone anti-collision light. It is super bright that can be easily seen at night from 3 miles away. It weighs only 5.9g that almost no impact on your drone flying, most of other competitors are more than 10g. VIFLY Beacon is a drone buzzer for any types of drones. Based on the motion sensor, it can detect the abnormal movement of the quads and make the alarm automatically to help you find the lost quad easily when the quad crashed. Some aerial drones like DJI have GPS, but it only provides you the draft location when you crash it, with the sound help, you can find your quad precisely. Very easy to setup, everyone can make it work even you are a newbie. Install it on your DJI quads, FPV quads or airplanes to prevent the drone losing again.