ACR PLB-375 ResQLink Personal Locating Beacon with 406 MHz Floating PLB Built-In GPS Strobe
http://www.amazon.com/gp/product/B006JXY0CQ?tag=sukses2015-20
Miniature design small as a cell phone floats
406 MHz satellite signal
121 MHz homing beacon
Built-in GPS
Built-in LED strobe