Docomo has introduced a new smartphone jacket prototype. What makes this smartphone jacket special is that it comes equipped with built-in sensors. It is not only protect your precious handset from scratches and bumps but also add extra functions through the use of various sensors such as an UV sensor, a breath odor sensor and a radiation sensor. There is also a health management sensor, which can check the user’s body fat and muscle ratios after exercise. Docomo will launch the smartphone jacket in the near future. Stay tuned for more updates. Watch the video after the jump.