Feature: 1. 2.4GHz Wireless: The number pad uses 2.4GHz wireless technology, plug and play, no device driver, can be used with confidence 2. 22 Keys: The number keypad is a full size 22 key keypad, professionally designed, suitable for laptops, banks, schools, companies, etc 3. ABS Material: The number keypad is made of ABS material, the compact and slim design is suitable for the numeric keypad and easy to carry around 4. Stable Transmission: The number pad ensures stable signal transmission, which is a delay free number pad 5. Wide Compatible: The wireless number pad compatible with for Android Tablet, for Linux, Desktop, for Win XP, for Win Vista, for Win 7, for Win 8, for Win 10 series Specification: Item Type: Number Pad Material: ABS Interface: USB Connection Method: 2.4G Wireless Effective Distance: Approx. 10meters/10.9yd Number of Keys: 22 Keys Battery Type: 1 x AAA Alkaline Battery (delivered without battery) Support System: For Win, for Android, for OS X and Other Systems. Package List: 1 x Number Pad1 x Receiver1 x User Manual Note: Shipped Without Battery