The Pokémon GO Plus accessory will soon be available from Gamestop and Amazon

The Pokémon GO Plus accessory allows players to collect from PokéStops, capture previously captured Pokémon, and hatch eggs. This will help save battery on your phone while also allowing you to perform actions quicker. The device will vibrate when a PokéStop is nearby and allow you to click the button to collect from it. It will also vibrate when a previously caught Pokémon is nearby and allow you to catch it by pressing the button. The accessory looks like the combination of a PokéBall and a Google Maps pin, as seen below.

The Pokémon GO Plus accessory should be available by the end of the month for $34.99 and can be bought from the links below:
Amazon
GameStop