Ultra slim design: the flexible keyboard’s flat design also offers an easy typing without stress of your wrists Silent avoid the interference of others to rest effectively (especially for people living in the same room) Anti-pollution, acid, alkali-proof, dustproof, and waterproof (merely for the silicone parts) Working environment: -20 to 55°C Humidity: 20 to 50% Adopts 2.4GHz frequency wireless transmission, strong anti-jamming capability The effective electricity-saving ability can let two AAA batteries maintain over 1 year in a normal condition for daily use Receiver USB2.0 connector Operation distance: 10m Working voltage: 2.2 to 3.3V Working current: <5mA Dormancy current: <100uA Dimensions: 412 x 218 x 15mm