ABOUT FLASH ALERTS ON CALL AND SMS ★ The flash will blink when mobile phone receives a Call, Message or Notification of all apps ★ Very useful to help you not miss Call, sms in dark night even mobile phone is in Vibrate or silent FEATURES: ✔ Install LED Flash for Alerts when mobile phone is in Vibrate or Silent. ✔ Easily to adjust speed of light to blink, blink frequency to be slow or fast ✔ You can install for Call or text as well as install for other applications or software on mobile phone.