Features: OOTDTY   BZGNSS cost-effective-GPS, fast star-search, search more-stars, accurate positioning. BZ-251GPS built-in QMC5883 electronic-compass, with GPS-positioning accuracy. Can be used with F4 F7-and other flight-control, to achieve-more flight functions. Built-in RTC-crystal and picofarads capacitance. Antenna: ceramic-antenna (oil-spraying process, prevent scratching and oxidation) Specifications: Material:Plastic Size:As Picture Shown Package Includes: 1pcs GPS-Module Note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you-do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.