Take your weather station with you with Weather Station Key Chain Literally with this powerful weather station keychain. Features include weather forecast with moon phases, temp and humidity, alarm clock with snooze function, calendar with date, day and year display, min/max temp and humidity memory, built-in compass and LED flashlight. Requires 2 button cell batteries, included. Approx. 3.5″ x 1.5″ x .75″.