Features: 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. It will auto power off when not in use for 10 minutes, effectively increase the battery life. 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 19 keys Wireless Digital Keypad Specifications: Operating Frequency: 2.4G Technology Structure Fixed way: Fastening buckle bitv for Case Material: ABS Power Supply: 1 x AAA Battery (Not included) Effective Distance: Approximately 32.8FT (10M) Item Size: approx 133x97mm/5.24x3.82in Material: ABS 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!