Incoming Call LED Flash Alerts Feature With a simple set up in your iPhone, the Incoming Call LED Flash Alerts remind you of calls, attracting your eyes immediately in dark, noisy places or daytime [To activate the LED Flash Alert feature: Settings > General > Accessibility > Turn on "LED Flash for Alerts"] Alixo 6S Specifications Dimensions: 5.9 x 2.8 x 0.4 inches Be sure to find the official New Trent logo to ensure a 10 months warranty.