Features: and high quality Uses advanced 2.4GHz wireless technology, plug and play, no additional drivers required Signal transmission stability, working range up to 33ft Integrated ergonomic tilt provides comfort which helps reduce strain Great spring action and comfortable key sizes respond quickly, improving work efficiency ABS material, small and slim design, numeric keypad is easy to carry Wireless number pad works with PC, laptop, and desktop computers with Windows 2000 / XP / Vista / 7 / 8 / 10 and later systems Package Includes: 1 x 2.4G 18-key Wireless Digital Keypad Specifications: Operating Frequency: 2.4G Technology Power Supply: 1 x AAA Battery (Not included) Effective Distance: Approximately 32.8FT (10M) Item Size: approx 140x85x20mm / 5.51x3.35x0.79in Material: ABS Number of Keys: 18 keys Note: Please allow 0-1cm error due to manual measurement. Please ensure you are comfortable with this before purchasing. Due to differences between monitors, the picture may not reflect the actual color of the item. Thank you