DeLorme inReach SE Satellite Communicator makes any adventure better and safer. With inReach SE, you can send and receive text messages at the ends of the earth and everywhere in between with the handy color screen and virtual keyboard. Designed for maximum durability in harsh environments, it's waterproof, dustproof and impact-resistant. When you're off the grid and out of cell-phone range, you can quickly and easily share your journey with family and friends, let them ping and message you and receive a delivery confirmation that your message was sent. This is all thanks to the Iridium satellite network with 100% global coverage. And in the event of an emergency, you can trigger an SOS, receive delivery confirmation and then have a two-way text conversation with the search-and-rescue monitoring center until help arrives. The inReach SE can be used in conjunction with DeLorme's Earthmate app on your mobile device. Transform your smartphone or tablet into a global satellite communication and navigation tool with the free Earthmate app. Subscription with an annual contract are required for InReach satellite communication and tracking. Runs on an internal lithium polymer battery (included). 5.75""H x 2.4"W x 1""D. Wt: 7 oz.