ZUS Smart Tire Safety Monitor provides real-time tire pressure alerts and more. Available as a self-installable external sensor kit, nondas Smart Tire Safety Monitor features a USB-powered receiver with 4 external sensors that transmit data via Bluetooth directly to the ZUS app. Showing the tire pressure for all 4 tires in real time, the monitor can quickly detect punctures and/or excess temperature, giving both a visual and audible warning to alert the driver of possible tire failure. While the receiver utilizes a USB port, it does come with a USB output port for charging your mobile devices or GPS unit. As a result, you never lose a USB port. Box Includes: sensor x4 receiver x1 anti-theft lock x4 installation kit Description < ZUS Smart Tire Safety Monitor Operating System < iOS, Android Adjustable < No Water Resistant < Yes Consumer Web Description < ZUS Smart Tire Safety Monitor provides real-time tire pressure alerts and more. Available as a self-installable external sensor kit, nondas Smart Tire Safety Monitor features a USB-powered receiver with 4 external sensors that transmit data via Bluetooth directly to the ZUS app. Showing the tire pressure for all 4 tires in real time, the monitor can quickly detect punctures and/or excess temperature, giving both a visual and audible warning to alert the driver of possible tire failure. While the receiver utilizes a USB port, it does come with a USB output port for charging your mobile devices or GPS unit. As a result, you never lose a USB port. Box Includes: sensor x4 receiver x1 anti-theft lock x4 installation kit Packaging < Retail packaged