With all the features that UK carp anglers have come to expect on an alarm in the form of tone, volume and sensitivity adjustment, the SNZs are impressive for the money. With neat features such as the subtle night light function, they can be bought singularly or as a set with a receiver. They come supplied with plastic protective covers. The receiver has a built-in courtesy light that can be turned on and off manually. As you would expect, they are totally waterproof and conveniently require a 9V battery to work them, which makes getting hold of them easy should you get caught out.