Useless product, it claims to have a range of 600m but at 100m it does nothing even though I had visual contact with the dog. If you want to get your job done, choose something else.

I have it for 4 months. It's awesome, it has immediate results. My dog weighs 40 kilos and is very aggressive towards other dogs (that's why I bought it). As soon as I press the vibration, he comes close to me ignoring the other dogs. I highly recommend it! It charges simply with a charger for a few hours. Just be careful to charge the collar correctly.