Adafruit Ultimate GPS HAT for Raspberry Pi A+ or B+ Mini Kit 165 dBm sensitivity, 10 Hz updates, 66 channels Built in Real Time Clock (RTC) - slot in a CR1220 backup battery for 7-years or more of timekeeping even if the Raspberry Pi is off! Internal patch antenna which works quite well when used outdoors + u.FL connector for external active antenna for when used indoors or in locations without a clear sky view Fix status LED blinks to let you know when the GPS has determined the current coordinates Raspberry Pi *not* included