SkyRC GPS Speedometer Altimeter For RC Car, Plane, Quadcopter GSM-010 Stop guessing how fast your RC car is going or how high your plane/helicopter is flying! Record speed and altitude in real-time and store top speed/altitude. 4M of built-in flash memory to store up to 6 hours of a run. Information can be downloaded to Google Earth to log your trip. Built-in rechargeable, LiPo battery 200mAh (Operating time: 150 minutes), Firmware upgradable See pictures and description for full specifications.NOTE: The default setting is KPH, can be switched to MPH via PC application (instructions included).