Design launcher icon for my Android application

My Android application, Sms Alarm, is in urgent need for a new launcher icon, so this job should be fairly small for anyone used to design. Some info about Sms Alarm. In short it is an alarming application, the alarms are triggered by receiving sms from predefined numbers, or by parsing the sms to see if a predefined word is found. In those cases an alarm is triggered, by playing a very specific alarm signal(about a 100 signals to choose from), vibrate in a specific way, show some other notifications and so on. There is also a possibility to acknowledge an income alarm by placing a call. The purpose of the application is to make users react to important sms faster and from it's beginning it was targetet to rescue personnel but lately it has also been used by system administrators and other personnel which receives important messages by sms. Check Google Play for more info, [login to view URL] Now I'm developing a larger release of Sms Alarm, and I thought it would be nice to get a new launch icon for it. For now it's a yellow helmet with a vector look. But I would like to have a more general icon, with references to sms and alarm. Some constraints: -Must not contain text. -Clean look, I use some default Android Lollipop icons whitin the app so something like them would be nice. -Colors is fine to use, yellow and blue are good to go but others could work also. -I would like to have the final icon as vector graphics *.svg -If you feel for it, you can also make the ldpi, mdpi, hdpi and xhdpi version of the final icon, but this is no requirement.