1GPS dual system compatibility, two star positioning function, speed, distance, 9 sets course reversal/return records. 2Height gain/loss, 7x 24 hours historical height data/curve recording. 3Height change interval prompt, can set range of 1~200 meters. 4Height target reminder settings, historical height data analysis, temperature and humidity records, 24 hours air pressure trend curve display, 16 azimuth electronic compass function. 5Temperature, humidity, time, date, alarm clock, flashlight function, built-in rechargeable lithium battery, IPX4 waterproof grade. Condition: 100% Item Type: GPS Electronic AltimeterModel: FR510Material: ABSColor: As Pictures ShownBattery: Built-in rechargeable lithium batteryBattery mAh: 5V 230mhaWorking Temperature: -20--+60/-4F--+140FStorage Temperature: -30--+60/-22F--+140FAltimeterDisplay Range: -500m--9000mDisplay Range: 300--1100hpaResolution: 1m/3ft-1640ft--32760ftResolution: 1m/3ftTemperature Measurement Range: 20%-95%BarometerDisplay Range: 300--1100hpa8.8--32.60inHgResolution: 0.1hpa/0.03inHgMoon: GPS Dual Moon System CompatibleThermometerResolution: 1/1FCompassResolution: 1Weight: Approx. 136gDisplay Length: Approx. 48mm/1.89inchDisplay Width: Approx. 31.8mm/1.25inchThickness: Approx. 20mm/0.79inchSize: Approx. 100x66x20mm/3.94x2.60x0.79inch 1 x GPS Electronic Altimeter2 xUser Manual1 x Hanging Rope1 xWiping Cloth1 x USB Cable