I received this collar and it worked great for the first several days. The remote then stopped working and the screen was just flashing, I thought the battery was just dead and but after charging it continues to flash and not turn on. I contacted the seller and a replacement collar and remote are being sent and should be arriving in a few days. I think overall it’s probably a great product and the one I received was just defective which is why I opted for a replacement instead of a refund.