GoPro HERO cameras are quite useful tools to take advantage of to capture all the action outdoors. The existing models were already compact, but the new HERO4 Session is the lightest, smallest model in the family. It lets you capture 8MP still shots and high resolution 1440p30 and 1080p60 video in the outdoors. It can be controlled using the GoPro app or Smart Remote.
The HERO4 Session camera is waterproof to 10 meters. Its SuperView mode lets you capture more immersive videos. There is a 1030mAh inside that lasts about 2 hours with WiFi off. This small camera will be available for just under $400.[Source]