Features: brand new and high quality Using advanced 2.4GHz wireless technology, plug and for play, no additional drivers required. Signal transmission stability, working range up to 33ft. Integrated ergonomic tilt provides comfort which helps reduce strain; The great spring action and comfortable for key sizes respond quickly, improving your work efficiency. ABS material, small, slim design, Numeric Keypad is easy to take with you, Wireless number pad works with PC, laptop and desktop computers that have for Windows 2000 / XP / Vista / 7 / 8 / 10 etc systems . Package Includes: 1 x 2.4G 18 keys 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. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!