Without using any external battery or power source, the case uses the LED flash light to show your notifications and incoming calls on your Samsung Galaxy E7. Whenever a new notification comes in, the case is designed to illuminates across corners using the light from your flash. All you need to do is go to your phone settings and turn on the LED notifications for incoming calls. Having minimal impact on your battery's life, LED notifications use up less than 1% of your battery life for an entire day's worth of use. The case itself is made of High Quality Material: Constructed using high quality Thermoplastic Polyurethane (TPU), the case also acts as a protective shield for your phone, guarding your case from drops. The case is ergonomically designed with a curved surface to ensure maximum comfort while using your device.
You can watch a demo of how the case works here: https://www.youtube.com/watch?v=5EPGv41WJp4 Package includes Ultra Portable Wireless Bluetooth Speaker with FM Radio, MicroSD Card Support and Microphone that fills your space with loud and clear music.