It won't be long and someone will use a data-sniffer to figure out, how the communication protocol between app and plus gadget works and will create an app for either Android and/or iOS simulating the plus gadget and instead working with e.g. smart watches or bluetooth headsets (you'll hear a sound and can react with the call-button of the handset)
wouldn't be funny if there was also a variant similar to the watch that appeared on Black and White... (surprisingly enough, i imagine that watch was like the precursor to modern smartphones in the pokemon universe...)
When it reacts, push the button to attempt to catch Pokemon without even needing to look at your phoneHow's that!Push the button at Pokestops to receive items as wellLinks to your smartphoneI'd like it if Pokemon Go Plus was an app on your Apple Watch...GoPlus buttonWalk about without the excessive battery drain on your smartphone! It's convenient!Therefore:or it had a more mature design!But the only designs for it look a bit kiddy...I caught a Pokemon!