DUAL GPS AND BEIDOU NAVIGATION SYSTEM: GPS navigation receiver weather forecast, dual satellite tracking ensures more accurate navigation. We believe that a handheld GPS is your best bet for confidently navigating terrain far out of cell range. ACCURATE POSITIONING: Multifunctional compass, multifunctional, it displays many important data such as altitude , ascent rate, compass, atmospheric pressure, time, temperature, humidity, etc. DURABLE AND PRACTICAL: Digital barometric altimeter, made from premium quality plastic and good quality plastic quality, sturdy and durable, working temperature is -20 to 60 can, can withstand harsh weather conditions, suitable for many places. EXCELLENT ENDURANCE: USB thermometer, supports USB charging, easy to use , large capacity battery can provide long standby and working time. EMERGENCY LIGHT: Barometer, equipped with a mini flashlight on the top, can offer emergency light, also suitable for outdoor night activities.