The T-BOX (SP200) is a more permanently mounted system that is mounted in a boat with access to a 12 volt power supply (not included). As the name implies, SonarPhone turns your smart phone or tablet into a fully functional sonar system that will rival any high end sonar on the market today. Using Patented WiFi signal technology to transmit to smart phones or tablets. You don't need cell phone coverage to use it, the SonarPhone will work anywhere in the world. The SonarPhone creates its own WiFi hotspot and you can share your signal with as many people as you wish, the software App is downloaded for free from the App store and works with both Android and IOS systems. SonarPhone will be offering limited world-wide distribution in 17 languages in 2014 and is available in three different configurations. All SonarPhone T-BOXes come with a neoprene arm band so you will have easy and safe access to your phone display at all times. Features: Compatibility: iOS 4.3 (iPhone, iPad) and Android 2.0; Free App download; Automatic Ranging; Water Temperature & Depth Indicator; Audible Alarms for Fish, Shallow and Low Battery; Fish Icon; Zoom Bottom Track; Noise Rejection; Surface Clarity; Battery Indicator; One year warranty.