Product specifications: Product name: mechanical one-handed keyboard Number of keys: 35key/33key Transmission method: wired USB Key life: 5000W times Operating temperature: 0oC to 40oC Working humidity: =85% Working voltage: 5V±0.5 Working current: =350mA (MAX) Applicable system: Win2000, Win XP, Win ME, Vista, Win7, Win8, WIN10 Package includes: 1×keyboard