I did buy directly 4 units for around…
I did buy directly 4 units for around 500 dollars to deter once a year birds from cherry trees. After 3 weeks of using 1 years ago keeping in storage none of them works. Charge from charger at home plus on sun. Only at the end of the day when sun goes down it makes 2 times sounds. Obviously built in batteries are crap. Called to tech support several times. Their answer is supposed to work after changing at home with original charger And 1 year warranty. So lost time, money, season, cherries. 1 year 40 days old trash . Sealed to point that has to be broken apart completely to replace battery. What a shame