Emperor of Gadgets &reg; Sunroad FR500 Multifunction LCD Digital Altimeter Barometer Compass Thermometer Multifunction digital altimeter barometer compass maximize your sports hobby enjoyment. Adopt super-accuracy sensor from Swiss. Includes altimeter, barometer, compass functions etc. thermometer, hygrometer, time, date, alarm, LED flashlight. Max / min altitude, temperature, humidity record. 24 hours barometric pressure trend chart. Weatherproof design with integral Keychain slot and compact form that can be worn around the neck hung on a belt or pocket or on the handlebars of a bicycle fitted. Built-in rechargeable battery. power over a long weekend with no worries.