It is apparently a normal clear case, but its hidden pattern is lit up beautifully everytime your phone rings or vibrates.

This case is made of polycarbonate, and protects your iPhone firmly.
Additional battery is not necessary as the case flashes by LED light of your iPhone.
You can use the camera flash withough removing the case as it has a sliding lid for LED light.

How to set up

Tap "Settings" > "General" > "Accessibility" > Flip "LED Flash for Alerts" to the ON.

iPhone6s / iPhone6

iPhone6s Plus / iPhone6 Plus