... , waterproof (merely for the silicone parts)Workable environment:-20C to 55C Humidity:20%-50%Adopt 2.4GHZ frequency wireless transmission ... for daily use . Operation of Computer system requirements:Work with Windows 98, ME, 2000, XP, Vista and Apple operating systemHow to USE? 1. ... First of all, the keyboard using a battery installed,Code of the keyboard Leds flash to show ...