" http://www.amazon.com/gp/product/B006JXY0CQ?tag=httpbabyand07-20
Miniature design small as a cell phone floats
406 MHz satellite signal
121 MHz homing beacon
Built-in GPS
Built-in LED strobe
ACR PLB-375 ResQLink+ Personal Locating Beacon with 406 MHz Floating PLB Built-In GPS Strobe"
