It is an ingenious wireless numeric keypad, which can be used via 2.4GHz wireless connection and keep your workplace free of clutter of wires and plugs. You will find your work effciency and productivity improved greatly with this wireless numeric keypad. Features: Plug and Play: 2.4G wireless connection via USB receiver, no drivers needed, plug and play, enjoy long-range wireless control up to 10 meters. User-friendly: 19 keys number pad, including a powerful "000" key, greatly improve work efficiency. About 5mm space bettween the keycaps effectively avoids typing errors. Mechanical Feel: Suspended keycaps provides clicky feedback and mechanical feel keystroke. Curved surface fits the shape of your finger and ensures comfortable typing. Water-proof: Crater design keycaps are higher than the bottom board, no need to worry about splashing water by accident. Power Saving: Support automatical hibernation mode, energy saving, extended battery life. One AAA battery is needed (not included) for the keypad to work. Note: Please do not immerse the keypad into water. Specification: Case Material: ABS Operating Frequency: 2.4GHz Effective Distance: about 10 meters (no obstacle) Number of Key: 19 keys Keycaps Life: more than 10 million times Application: Desktop, Laptop, Notebook System Supported: for Windows / Android / Mac OS Power Supply: 1 * AAA Battery (not included) Rating: 1.5V 6mA Color: Black Main Item Size: 13.5 * 8.7 * 3.3cm / 5.31 * 3.42 * 1.30in Main Item Weight: 98g / 3.46oz Package Size: 14.5 * 11.5 * 3.9cm / 5.70 * 4.52 * 1.53in Package Weight: 134g / 4.71oz Package List: 1 * 2.4G Wireless Numeric Keypad 1 * USB Receiver