• Easy setup, simply insert the USB receiver into your computer or laptop and use the keyboard instantly • Easily switch operation system, press key "FN"+"Q" for iOS system, press "FN"+"W" for Windows system • The built-in 2.4GHz signal creates a disruption-free connection to your computer, which means you can work without delays • 78 keys offer quiet and comfortable typing • Ergonomic design, matte surface shell for comfortable touch feeling • Compatible with Windows/Mac/iOS/Linus, etc Specification: • Brand: YESIDO • Number of keys: 78 keys • Wireless distance: ≤10m • Dual chip: Bluetooth+2.4GHz • Button life: 300 million times • working voltage: 3.0-4.2V • Working current: ≤2.5mA Specifications :  Brand : YESIDO User Manual (Language)English Gross Weight : 0.336Kg Volume Weight : 0.202kg Package Length : 28.900cm Package Width : 13.250cm Package Height : 2.350cm Product packaging : Colored Box