Sanwa Supply Bluetooth Slim Keyboard (with numeric keypad, black) SKB-BT31BK

It can connect to devices with built-in Bluetooth, such as PCs and smartphones, without a receiver. It can be used with a variety of devices, including Windows, Android, macOS, and iOS. It can register up to three devices and change device connections with the push of a button. Its ultra-slim design is just 6mm at its thinnest point. Its thickest point is only 14.4mm, making it convenient to carry and store. It uses the same pantograph key system as laptops. The key design is an isolation type, reducing the risk of catching your fingernails.