These window mount feeders are a great idea...problem is, they are extremely fragile.  I've gone through 7 of these and several have been replaced by Amazon. Customer service is not the problem. Now the feeders are coming with a defective suction cup. I could tell the cup was made from a different compound as the cup is now opaque rather than clear. After a few days, the suction cup falls from the window and the fragile feeder breaks.  If the tank is not cracked it can be swapped for another base. ( I have several of these from feeders that have fallen when the base survives).  The company needs to get a better suction cup. I suppose there might be something available in a hardware store that would work. Also the tabs that connect the tank to the base break very easily.