1. Stable wireless connection function, effective control range up to 10meter.2. The numeric keyboard uses the mute to create a quiet typing environment for you.3. Low power consumption, strong battery life up to 12 months, long battery life.4. 2.4GHz wireless connection, 18-key design, with backspace key, you can easily correct the text.5. System requirements for Windows XP/Win7/Win8/Win10/IOS, with strong adaptability.Spec:Item Type: Wireless Numeric KeyboardProduct Model: AK18Product Name: 2.4G wireless numeric keyboardProduct Size: Approx. 89 x 129 x 27.5mm / 3.5 x 5.1 x 1.1inWeight: Approx. 100 g / 3.5 oz (5 g / 0.2 oz)(including counterweight)Battery Type: 1 x AAA battery (not included)Number of Keys: 18keyConnection Method: RF 2.4GHzSystem Requirements: For Windows XP/Win7/Win8/Win10/IOSPackage List:1 x 2.4G Wireless Numeric Keyboard1 x Receiver1 x User ManualNotice:Manual measurement, there is an error of 0.5mm, please refer to the actual product.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.