Feature: 1. With the characteristics of low power consumption, long life and high precision, which can well meet your needs. 2. Numbers and pointers can be clearly displayed in the dial, so that you can read it easily in the dark. 3. GPS three‑in‑one design is more powerful and is more convenient, which also can function well for you. 4. Using the stepping motor to increase the sensitivity, which is very convenient for your use. 5. This GPS three‑in‑one tachometer is easy to be installed with the manual, which can save time for you. Specification: Item Type: GPS Speedometer Material: ABS + Stainless Steel Screen: OLED Screen Cog: Angle of Navigation, Navigation Direction Trip: Single Mileage, Power Outage Cumulative Total Mileage: 0-999999NM Waterproof and Dustproof Level: IP67 Applicable To: Car / Truck / Ship. Package List: 1 x GPS Speedometer1 x Manual1 x GPS Antenna