MINGLE BKT381 Multi-function Altimeter with Compass & Barometer & Thermometer

MINGLE BKT381 Multi-function Altimeter with Compass & Barometer & Thermometer1. Bring pleasure in your climbing, hiking, skiing and other outdoor sports 2. Mechanical and battery free 3. Always makes you ready for weather changes with weather forecast function 4.With compass, thermometer and hook, satisfies all requirements in sports 5. Altimeter measuring range: 0-5000m 6. Barometer pressure range: 600-1000hPa 7. Temperature measuring range: -30-50 Degrees Celsius...