GoPro has unveiled its smallest action-cam to date, the HERO4 Session. 50% smaller and 40% lighter than other HERO4 cameras, the Session is billed as the most wearable and mountable GoPro ever. It features a waterproof case that houses a sensor capable of shooting 1080p video at up to 60 fps and 1440p video at up to 30 fps, plus eight megapixel photos in Single, Burst and Time Lapse modes. It's activated with a single press of the shutter button and allows for two hours of recording on a single charge. Additional features include a dual-mic system and built-in Bluetooth and Wi-Fi. Retailing for $399, the GoPro HERO4 Session launches July 12.