Water activation: There is no switch on the submarine. When it is placed in the water, the Remote control devil fish will be activated ? Mobile remote control: This Devil's Fish does not come with a remote control. It uses a mobile app to download, and connects to the phone through the Devil's Fish's built-in WIFI. The high-definition camera of the remote-controlled photography boat can capture real-time underwater images. Real time imaging provides an immersive experience, supporting snapshot and video shooting, recording moments at any time, and photos can be saved in the device's "Photos" folder.