Ordered 2 of these to try and get rid of geese in our neighborhood pond - its about 2 acres.

First one went on a pole sunk into the mud and started flashing away the very same night. Got some worried texts from neighbors asking if we'd lost a drone in the pond, and then someone thought something had fallen off a plane and was in the process of calling the police - ie, they are pretty bright and visible from at least 1/4 mile away..
The other is stuck on top of an inverted bucket and is happily bobbing around the pond working like a champ.
Since storms have been rolling up Eastern US this April, we had a water level rise of about a foot in the pond and the light on the pole disappeared beneath the water surface - I thought someone had removed it but no, it was there and I figured it was toast. When the water level dropped, it started flashing again - so they are sealed very well indeed! Not sure I would tip it upside down in water as that would let water in through the switch, but since it was anchored to the bottom and the switch is protected on the bottom inside the plastic collar, it remained fully functional when it emerged again... great!

Geese aren't a big fan of them and we've got 2 hold outs as opposed to the flock of 20 from this time last year.

Well worth it, and considering "real" geese lights are closed to $300-400, well worth a bit of fiddling around with.

Works even on a days with little sunlight. I live on a dead end street and this product is great to inform where the street ends for the snow plowers and new drives.

Great littl self contained unit, wish they were a little brighter but at night they can be seen just fine. Turned on both lights to see if they worked and the photocell turned on and off the light like they should, both worked and I'm going to place them in sunlight to charge them. The area I have then get direst sunlight 2/3rds of the day and that seems to carry them thru the night no problem. Advice, like with any solar charged product make sure you place them in direct sunlight for the first day so to fully charge the battery, also if you can place them in a spot that can get the most available sunlight during the day this way the batteries only have to be topped off during the charging cycle.

Charged for a few hours, and blinked all night. Using the strobe on a wind turbine tower. Not high enough to actually require an FCC approved strobe, but with all the drone and helicopters in the area, it was a good choice.

Works really well charges up very good in low daylight. I used this as prop in my yard on an old tailcone of an airplane. Yes I'm not married haha but this was the exact product I wanted and it well suited for outdoors!