Exchange texts, photos and voice messages without cell service; Pair with the Garmin messenger smartphone app for group messaging and more; Trigger an interactive SOS message to Garmin response, 24/7-staffed international coordination center; Use the Garmin explore smartphone app to plan your trip, track your activity and more; Easily navigate back to where you started with the tracback routing feature; Use the Garmin messenger app to share your GPS location via live tracking; Made to operate in extreme temperatures, the compact inReach Messenger Plus is tough, durable, impact-resistant and water-rated to IPX7; Internal, rechargeable lithium battery gives you up to 25 days of battery life in 10-minute tracking mode