Features: Adopt super-accuracy sensor from Swiss. Altitude total gain/loss, 24 hours altitude record and chart. Max/min altitude, temperature, huminity record. 24 hours air pressure trend chart. Incorporates altimeter, barometer, compass functions, etc. Thermometer, hygrometer, time, date, alarm clock, LED torch. Built-in rechargable battery. LCD backlit. IPX 4 waterproof.