The most important functions can be controlled even without smartphone but naturally comfortable (set up within 2 minutes - just in PlayStore Search "Panasonic Image app" and Install) but then with 2 devices neither waterproof nor handy.
We usually once everything with the camera viewing direction for a specific purpose, then the device is enough alone to start and stop recordings and uses battery power for on / off switch - is reliable and easy.
Who does not feel limited by the known Befestigungsmögichkeit to upper arm and head and non-removable battery, should pull the robust and now inexpensive mini-camera on the short list. Us makes them far much joy!