Stable bluetooth 5.1, with high speed of connection, compatible with most device supporting bluetooth, such as smartphones, Tablet PC, Desktop PC, Laptop, smart tv and so on. Rechargeable lithium battery with an industry-high capacity leads a long battery life, it can last for months between charges. Small size (8.7x6.7x0.4 inch) and light weight (7.8oz) offers all keys in full size, allows easily carried and packed backpack, a bag or case. Support IOS, Android, Windows system, Japanese one-key switch function, dual- FN function key, support F* key and multimedia control key switch to use The keyboard offers quiet and comfortable typing, the texture is detailed and feels gentle, the surface is dry and not easy to get wet. Specification: Size: 22cmx17cmx1cm/8.7x6.7x0.4 inches Weight: 220g Material: plastic Package Includes: 2 Piece Keyboard (Green+Pink)