The new watch accessory, Pokémon Go Plus, which allows players to catch Pokémon without pulling out their phone, has been delayed from July to September. The announcement was made via Twitter earlier today:
— Nintendo of America (@NintendoAmerica) 27 July 2016
The device will connect to your phone via bluetooth, and offer game notifications. These alerts include if a PokéStop is nearby, or if there is a Pokémon within range; if so, you will be able to press a button on the accessory to throw a PokéBall.