Features: Air75 is a revolutionary low profile mechanical keyboard that boasts a slim design. With a 75% layout consisting of 84 keys, resulting in the thinnest point of only 17mm. Unlike traditional keyboards, Air75 eliminates the need for a wrist rest, ergonomic angle making it comfortable for extended use without causing any wrist damage. Multi-Device Connection: Providing 3 connection modes - 2.4g=G wireless connecting, BT5.0 and wired type-C connecting. It supports to connect with computer, laptop, mobile phone, pad and tablet. Plug and play, compatible with MacOS, Windows system, and iOS and Android system, easy to switch without lagging. RGB Ligh-ting Effects: With 17 backlit modes and 5 brightness levels to adjust. And you can also adjust the speed of the dynamic ligh-ting effect, customize the stunning light effect as you like. Extra long Battery Life: Built-in 1850mAh rechargeable battery, the keyboard can use up to 180hrs after a full char-ge, take it to the out-door working without any power off problem. Stylish & Durable Key Cap: Silm &PBT material two-color injection moulding process key cap, PBT more wear-resistant, not easy to grease, dirty resistance does not fade. Specification: Model: YK75 Product Main Color: Light Grey, Beige, Grey (Optional) Mechanical Type: Gateron Red Switches, Gateron Blue Switches (Optional) Connection: 2.4G, BT5.0, Type-C 2.4G Connection Distance: 8meters BT5.0 Connection Distance: 5M Battery: 1850mAh, 3.7V Using Time: about 180hrs Flash ROM: 64KB Operating voltage: VDD = 3.3V - 5.5V Working environment temperature: - 40°C - + 85°C Package Size: 38x14x3cm/14.9x5.5x1.1in Package Weight: 650g/22.9oz Packing List: 1 x Keyboard 1 x 2.4G Receiver 1 x Cha-rge Cable