[Bluetooth 5.1 & multi-model compatible] It is equipped with a Bluetooth 5.1 chip, which provides excellent connection stability. It is compatible with iOS, Android, Mac and Windows devices. [Multi-pairing for up to 3 units] It is compatible with smartphones, tablets, and computers such as iPhone, iPad, and Andriod, and can be multi-paired with up to 3 devices. When you press the specified key, the connected device switches instantly. [With high-quality leather cover & stand] The exterior of the keyboard is covered with high-quality leather, and the design that combines texture and protection is perfect for businessmen. Made of high-quality leather, it is waterproof, dustproof and durable. If you use the included smartphone / tablet stand, you can work comfortably like a laptop. 【Compact and easy to carry】 Despite its compact size, it is possible to input characters without stress. When folded, it is 157 mm× 104 mm× 14 mm, which is an ultra-compact size about the size of an iPhone. The main body weighs only 129g, which is lighter than a general smartphone, so you can carry it like a smartphone. [Energy-saving design] It can be fully charged in 2 hours and can be used for about 40 hours. In addition, for power saving, an independent ON/OFF switch is designed and equipped with a smart sleep function. It can be used for a long time, making it ideal for business trips and travel.