Product description Specification: Operating Frequency: 2.4GHz Technology Effective Distance: Approximately 32.8FT (10M) Interface(s): USB 2.0 Case Material: ABS Mouse Tracing System: Optical Net Weight: 0.26 lb Mouse Size: 4.4 x 2.26 x 0.8 inch Keypad Size: 5.3 x 3.39 x 0.78 inch Power Supply: 3 * AAA Batteries (Not included) What's in the Box

• 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-SLIP AND PORTABLE DESIGN - There is four non-slip 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
• POWER SAVING - It will auto power off when not in use for 10 minutes, effectively increase the battery life.
• UNIVERSAL COMPATIBILITY - TRELC wireless number pad works with PC, laptop and desktop computers that have Windows 2000 / XP / Vista / 7 / 8 / 10 systems. The wireless 18-key numeric keypad is Not fully compatible with Mac OS.