Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: USB 19 keys Numeric/Number Keypad keyboard for Laptop Notebook
Product description: If you are conditioned to the numeric keypad of your desktop, and you are now feeling dissatisfactory about the loose number keys of your laptop, or your profession requires you to enter quite a lot of number list, like accountant, auditor etc, even you are a professional games player playing games that require using the number keys/arrows, you just need this new mini keypad with 19 keys, adding "BackSpace","Enter" and "000" , compare to the normal desktop numeric keyboard area, with which to convenient you much.
Product feature: USB 19 keys mini numberic keypad adding "BackSpace", "Enter", "000" three keys compare to the normal desktop numeric keyboard area., Plug-and-play, quiet noise and made of superior material, good tactile feedback and human body engineering design., Can be applicated in accounting, banking, stock, KARAOKE, medical etc, special designed for laptop, but it also works with desktop., 100% compatibles MS DOS Windows 32, Windows 95, Windows98, Windows Me, Windows 2000, Windows XP, Vista, Win7. NOTE: Win32, Win95, WinNT are not support USB device., Operation voltage: 5V, Operation current: Less than 50mA, Dimension: approx. 5.1" x 3.5" x 0.8" (130 x 90 x 10 mm),USB cable length: 4.95 feet (1.5 m), Weight: approx. 3.03 oz (86 g).12-month free replacement warranty for manufacturer defect.
Product brand: kingsmart
Target attributes: Connectivity
Answer: attribute: connectivity
value: None
source: None