The Pokemon GO Plus is a small device to connects to a smartphone via Bluetooth low energy and have the feature to notifies you about events in the game like the appearance of a Pokémon nearby follow after a LED and vibration.
The #PokemonGO Plus accessory will now be released Sept 2016 instead of the originally expected end of July launch. https://t.co/QgjZf1aAV6
— Nintendo of America (@NintendoAmerica) July 27, 2016
This wearable Pokemon GO Plus is served to be a low price point with mass appeal and popularity.