Useful for Pokemon Go. They work mostly as advertised. It can be set to buzz either when a Pokemon or pokestop are nearby, or both. For pokestops it'll still register one nearby as long as you're going under roughly 2mph and it recognizes being within range of a pokestop after the phone program does. For Pokemon, it registers a nearby Pokemon on the buzzer before the phone may even have it pop up.While catching Pokemon, you get one throw per Pokemon of a normal poke all and no other ball types. The catch rate seems dependent on the player using the plus as I don't have much luck on one, but am very successful on another.The feature I use this for most is when I am stationary on a pokestop. Each time the pokestop spinner cool down completes the plus buzzes automatically to indicate it can be spun again. In addition, while using the Pokemon go plus, it does not require the phone screen to be on, but it does require the app to be open. For example, my local gym where I work out is