Good purchase. Unlike others, I didn't have any issues with the company's application. Unfortunately, after six months, the QR code has become blurry and faded, making it no longer recognizable. I have had the collar for around 8 months now, and its color has faded quite a bit. However, I still use it constantly, even when we take the dog to the beach! So, I would say it is quite durable for its price.