New LED Color Changing Sense Flash Light Protector Case Cover For iPhone 4 4G 4S Make your iPhone 4 4G or 4S different. Light, shine, flash when calling and answering, sending and receiving message. All iPhone buttons are easily accessible while resting in iphone4 &4s shell casing. Note: 1.No Need to choose colors. Flash when calling and answering, sending and receiving message. Note: 2.Cases tested before shipped. If it not works when you receive it, please make sure put the battery in. If only light one color, Please consider changing another battery to try.