UPWADE Wireless Numeric Keypad 2.4G 18-Key USB Financial Numpad for Laptop Tablet Desktop PC Computer Effective Range This number keypad is up to 10m working range.Operating frequency: 2.4 G technology. Portable size 18-key Wireless Numerical Keyboard.Hibernation mode enables automatically, no power button needed. Easy to use Digital keyboard with 18 keys, Ideal for notebooks without a number pad Keys operate smoothly and quietly. Installing the batteries This keyboard use One AAA alkaline battery. Specification: Package size: 124 x 82 x 18mm Product size: 15.6 x 9 x 3.5cm Weight: 100g Effective Range: 6-10 Meters Operating frequency: 2.4 GHz technology 1AAA batteries: Current 5V  Package list: 1 x Wireless Keypad 1 x Mini Receiver