Estimated delivery time about one month, receipt in one week. Very easy to attach in seconds. It's a bit hard to let go, squeeze a few times and turn off the headlights, it falls, almost impossible to let go accidentally. Although you can't record the lights and turn them on and off, your live broadcast will be recorded as the lights turn on and off. Very light and seems to last a long time. Remember, don't forget to turn it on before you start! It is very difficult to go down with a parachutist on a fishing line! You'll get tangled in the strut and with any luck, the rope will snap, not your Mavic! I did about 20 drops and everything seems fine.