I like this one, rechargeable with a light to tell you when it's dead or charged，I've had other ones that you had to change the batteries and you don't know it's dead and they are the pricey watch type. I also like that this one gives a warning vibration，he has learned what that means and we don't hear him yelp from being shocked like the other ones. I don't really like the collar, it's just a piece of plastic with holes. which mean it doesn't loosen up, which is good.but you have to hope it's not one hole too tight or next hole too loose. All in all, it's a good value though and we like it.