Specification: With Noctilucent Display or Not: Yes.  Waterproof / Water-Resistant: Yes.  Size: 10 * 6.5 * 2cm / 3.9 * 2.6 * 0.8in.  Shockproof or Not: Yes.  Outdoor Activity: Tourism.  Outdoor Activity: Camp.  Outdoor Activity: Hike.  Dial Display: Digital.  Case Material: Plastic.  Carrying Mode: Handheld Type.  Material: Plastic.  Dimension: 10 * 6.5 * 2cm / 3.9 * 2.6 * 0.8in.  Weight: 75g / 2.6oz.  Package Size: 15.8 * 11 * 3.5cm / 6.2 * 4.3 * 1.4in.  Package Weight: 126g / 4.4oz.     Features: Adopt super-accuracy sensor from Swiss.  Incorporates GPS, altimeter, barometer, compass functions, etc.  Thermometer, hygrometer, time, date, alarm clock.  Altitude total gain/loss, 24 hours altitude record and chart.  Max/min altitude, temperature, huminity record.  24 hours air pressure trend chart.  Built-in rechargable battery.  LCD backlit and LED torch.  IPX 4 waterproof. (Do NOT submerge in water.).  Functions: GPS Course Return: Direction, distance, speed;  GPS course return selection;  Package List: 1 * Altimeter;  1 * Charging Cable;  1 * Wrist Strap;  1 * Cleaning Cloth;  1 * User Manual