The first thing I noticed was that the light option for the collar just didn't work. Whether or not the shock feature works is extremely hit or miss regardless of how close the remote is to the collar. The vibration works more consistently but fails to activate every time like it's supposed to. The only feature that, so far, has worked without fail is the beeping. The reason I'm not returning this is because I didn't get it for the shock feature, but for the vibration and beeping, and, even then, I tend to stick to the beeper 9 times out of 10 so it's not a total waste of money to me personally. I'm sure I just received a defective product and, yes, it can be frustrating, but it serves its purpose since it's only used for outdoor training and off-leash time for 30-60 minutes a day in a setting without many distractions. If there were people around or other animals, this would be entirely useless.