System Supported: for Windows / Android / Mac Power Saving: Support automatical hibernation mode, energy saving, extended battery life. One AAA battery is needed (not included) for the keypad to work. Number of Key: 19 keys Power Supply: 1 * AAA Battery (not included) Mechanical Feel: Suspended keycaps provides clicky and mechanical feel keystroke. Curved surface fits the shape of your finger and comfortable typing. Rating: 1.5V 6mA Effective Distance: about 10 (no obstacle) Keycaps Life: more than 10 million times 1 * USB Receiver Operating Frequency: 2.4GHz Package List: 1 * 2.4G Wireless Numeric Keypad Plug and Play: 2.4G wireless connection via USB receiver, no drivers needed, plug and play, enjoy long-range wireless control up to 10 . Color: Black Main Item Weight: 98g / 3.46oz Main Item Size: 13.5 * 8.7 * 3.3cm / 5.31 * 3.42 * 1.30in Package Size: 14.5 * 11.5 * 3.9cm / 5.70 * 4.52 * 1.53in Application: Desktop, Laptop, Notebook 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. Water-proof: Crater design keycaps are higher than the bottom board, no need to worry about splashing water by accident. Note: Please do not immerse the keypad into water. Case Material: ABS Wireless Charging Keyboard Main Item Weight: 98g / 3.46oz Main Item Size: 13.5 * 8.7 * 3.3cm / 5.31 * 3.42 * 1.30in Number Of Key: 19 Keys Color: Black Power Supply: 1 * AAA Battery (not Included) Wireless Media Keyboard Lite Keyboard Wireless Keyboard Gamer Wireless Laptop Keyboard 920-002565