If your Slim Wireless Keypad will not connect, the usual causes are a flat battery, the power switch still off, or the keypad not being in Pairing Mode when you look for it in Bluetooth settings. The Slim Wireless Keypad (ST-KSALKPM, ST-KSALKPS) connects over Bluetooth only and it needs a charge before first use.

How to connect your Slim Wireless Keypad

1. Charge the keypad for 2 to 3 hours before first use with the included USB-C to USB-C cable. A solid red LED means the keypad is charging, and the red LED turns off when it is fully charged.
2. Slide the On/Off switch on top of the keypad to the On position. The switch shows a green label when the keypad is on.
3. Press and hold the Connect button for about 5 seconds, until the blue LED begins blinking fast. Fast blinking means the keypad is in Pairing Mode.
4. On your Mac, PC, or mobile device, open Bluetooth settings, select "Bluetooth Keypad," and connect. Once the keypad is paired, the LED turns off.
5. If the keypad was paired to this device before, remove or forget it in Bluetooth settings first, then put the keypad back into Pairing Mode and pair it again.
6. If the keypad is connected but nothing happens when you type, press any key to wake it. The keypad enters sleep mode after about 1 hour of inactivity to preserve battery.
7. Do not plug the keypad into your computer expecting a wired connection. The Slim Wireless Keypad cannot be used by plugging directly into your computer, although you can keep using it wirelessly while it charges.
8. If the number keys do nothing or produce the wrong characters, make sure Num Lock is enabled.
9. Check your keyboard layout under System Settings, Keyboard, then Input Sources. The keypad layout follows iOS and macOS default settings, so output may differ on other operating systems.
10. If the keypad keeps dropping the connection, charge it first. A slowly blinking red LED means low battery, and low battery causes disconnections. Then move the keypad closer to your device and reduce interference from other wireless devices nearby.
11. Update your operating system, then forget the keypad in Bluetooth settings and pair it again.