1 keyboard, 3 devices, multiple pairing. The back mode button of the keyboard allows for easy setting of Bluetooth mode and wireless mode, which can be connected to devices such as laptops, smartphones, tablets, desktops, etc. Easy to change mode with a button. Turn on the power ON-O switch at the bottom of the keyboard. With the adjacent mode button, you can easily change the connection mode of the keyboard (2 Bluetooth+1 wireless) Fast and seamless Bluetooth 5.2 connection adopts Bluetooth 5.2 version, which can achieve faster and more stable connection and is compatible with devices that support Bluetooth Directly connected to the receiver in 2.4GHz wireless mode, using the SB receiver to automatically connect to RF, capable of transmitting up to 10 meters. No separate drivers and utilities need to be installed to use. Asynchronous Num Lock method: Pressing the Num Lock key on the keyboard does not affect the number keys on the laptop and keyboard. Use the keyboard independently in an asynchronous manner Type:numeric keyboard Connection method with computer: Bluetooth Material:ABS COLOR: yellow Package Contents: 1 x keyboard 1 x AAA (dry battery) 1 x English and Korean instructions Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.