• The numeric keypad will automatically enter sleep modeafter 60 minutes of inactivity. The indicator light will turn off.
• To wake the keypad, simply press any key. It will wake within 3 seconds, the indicator will light up again, and the keypad will resume working.

2.4G USB Connection

• Turn on the power switch.
• Press and hold the WiFi icon buttonuntil the 4G indicator lights up to activate 2.4G mode.
• Remove the USB receiverfrom the bottom of the numeric keypad.
• Plug the USB receiver into your computer's USB port.

Bluetooth Connection

• Turn on the power switch.
• Press and hold the Bluetooth icon buttonfor 3–5 seconds, until the Bluetooth channel indicator starts blinking rapidly.
• Enable Bluetooth on your device, search for or select “ProtoArcEK04 N”, and complete pairing and connection.

• When the battery is low, the red low battery indicatorwill flash until the keypad shuts down.
• To charge:
• Insert the Type-C endof the cable into the numeric keypad, and the USB-A end into a computer USB port.
• While charging, the red indicator will stay on.
• Charging takes approximately 2–3 hours. Once fully charged, the indicator turns green.

• Turn off the keypad.
• Press and hold the Esc + 3keys, then turn the power back on. The Bluetooth channel indicator will start flashing rapidly.
• On your device, turn on Bluetooth and search for or select “ProtoArcEK04 N”to complete pairing.
• If the Bluetooth name does not appear, toggle your PC’s Bluetooth off and back on, then try again.

• Turn on the keyboard.
• Press and hold the channel key with the WiFi symbol for 3–5 seconds until the channel indicator light starts flashing.
• Remove the USB receiver and then reinsert it into your computer.

After completing these steps, the keyboard will be re-paired with the receiver.