10m transmission distance, more convenient to use. With strong compatibility, fit for various phone, tablet, Android, for windows, for ios. Premium ABS keyboard gives you comfortable hand feeling. With multifunction touch control board which is of high sensitivities. Ultra-thin and lightweight, portable and easy to carry. Applicable system: SURFACE PRO3/PRO4/PRO5 Descriptions: Environmentally friendly PU shell is wear resistant and shockproof. Aluminum panel makes it solid and durable. Specially designed for working convenience. Specification: Interface:Bluetooth 3.0 Material of keyboard: ABS Panel material: aluminum alloy Back cover material: PU Powered by: built-in lithium battery Battery capacity: 350mah Continuous use time: 35 hours Color: black, golden, silver, rose gold, blue Size: 27*21*0.6cm Package includes: 1 x Keyboard 1 x USB Cable