Garmin inReach SE + Accesses the Iridium satellite network for world coverage Exchange text messages or emails with anyone on earth inReach function contacts a GEOS emergency response center Tracking function gives your loved ones your exact location Free app can sync unit up with your Apple or Android cell phone Stop worrying about being within range of a cell tower. Go ahead and travel the entire globe and Garmin's inReach SE+ will always keep you in contact because it directly accesses the Iridium satellite network which boasts world coverage. You could be deep in the jungles of Bolivia and exchange text messages with any cell phone number or email address anywhere on earth. In case of emergency its inReach function lets you send an SOS message to the contacts a 24/7 GEOS emergency response center. You can text back and forth about the nature of your situation and receive confirmation that help is on the way. If you want your loved ones to always know your exact location you can turn on the tracking function and they can watch your progress on their computers or mobile devices using the web-based MapShare portal. For maximum convenience the free Earthmate app can sync your inReach SE+ with your Apple or Android cell phone for unlimited access to detailed maps aerial imagery U.S. NOAA charts and more. The Earthmate app also delivers inReach weather forecasts for your current location. You'll also appreciate the basic grid navigation which allows you to drop waypoints mark key locations track progress and follow a mapped-out trail back to your base. Tough impact-resistant unit is IPX7 water-rated. Internal rechargeable lithium battery. Includes a micro-USB power cable. 6.5"H x 2.7"W x 1.5"D.