If you have an Osmo Mobile GoPro 4 or GoPro 3 adapter this is a great addition. This lets you use the GoPro App on your phone or iPod, so you can see what you're shooting in real time without having to use a tiny GoPro BacPac. I used this on a trip and managed to get the whole video in one frame. I recommend this to anyone who needs to see their phone or iPod while using the Osmo, Osmo+ or Osmo Mobile.