The Slim EX3 Wireless Keyboard can pair with up to three devices over Bluetooth plus one device through the included 2.4GHz USB-C receiver. To switch devices, press the dedicated Bluetooth key (1, 2, or 3) or the 2.4GHz receiver key for the device you want to use.

Assign a device to each key first:

1. Turn on the keyboard with the on/off switch on the top of the keyboard.
2. Press and hold one of the three Bluetooth keys for 3 seconds. The white LED blinks to show pairing mode.
3. On your device, open Bluetooth settings, select "EX3 Keyboard", and choose Connect. The white LED stops blinking when pairing is successful.
4. Repeat these steps with the other Bluetooth keys to add up to 3 Bluetooth devices.

To use the fourth connection, plug the 2.4GHz USB-C receiver into your device and press the 2.4GHz receiver key.