2.4GHz WIRELESS CONNECTION - Using advanced 2.4GHz wireless technology, plug and play, no additional drivers required. Signal transmission stability, working range up to 33ft. (The USB Receiver is inserted in the battery compartment of the keyboard.) ERGONOMIC DESIGN - Integrated ergonomic tilt provides comfort which helps reduce strain; The great spring action and comfortable key sizes respond quickly, improving your work efficiency, great for those working on spreadsheets, accounting files or financial applications. ANTI- AND PORTABLE DESIGN - There is four non- mat on the back of the number keyboard, which prevents it from sliding around your desk when in use. This sturdy number pad is easy to take with you, so you can work confidently and quickly-wherever and where UNIVERSAL COMPATIBILITY - wireless number pad works with PC, laptop and desktop computers that have Windows 2000 / XP / Vista / 7 / 8 / 10 . Colour:Black Material:plastic Package Contents: 1 x Wireless Digital Keypad 1 x Wireless Mouse Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.