Designed with advance uv detecting technology according to who standard Uv mode: displays uv index from 0 to 18 Adjustable skin tone setting: allows user to select skin type from 1 to 4 Adjustable spf setting: allows user to input spf protection level from 0 to 99 Exposure mode: after personal skin type & spf selection is made, sensor will Indicate How much sun exposure is acceptable Temperature mode: gives ambient temperature, °c / °f switchable Sunburn alarm: will alert user through beeping that reapplication of Sunscreen is Necessary Sporty design with 14cm strap in pink, blue, yellow, orange for selection, Easy to carry & use Low power cosuption: stand-by 10ua working 1ma Application: Good for skiing, water skiing, swimming sunbathing, camping, bicyling & outdoor activities