Welcome to the store! Stable wireless connection function, effective control range up to 10 meters. The numeric keypad uses the silent button to create a quiet typing environment for you. Low power consumption, strong battery life up to 12 months, long battery life. 2.4GHz wireless connection, 18-key design, with backspace key, you can easily correct text. System requirements for Windows XP/Win7/Win8/Win10/IOS, with strong adaptability. Item Type: AJAZZ Wireless Numeric Keypad Product Model: AK18 Product Name: 2.4G Wireless Numeric Keypad Product Size: Approx. 89 x 129 x 27.5 mm / 3.5 x 5.1 x 1.1 inches Weight: Approx. 100g / 3.5oz ± (5g / 0.2oz) (including counterweight) Battery Type: 1 x AAA battery (not included) Number of Keys: 18 keys Connection Method: RF 2.4GHz System Requirements: For Windows XP/Win7/Win8/Win10/IOS 1 x 2.4G Wireless Numeric Keypad 1 x Receiver 1 x User Manual