Specification: Product Type: 2.4G wireless/wired numeric keyboard Button life: more than 10 million times Battery: 1.5V Product size: 133*128*22mm Packing size: 138*130*25mm Net weight: 85g Gross weight: 102g Support system: for windowns98 / 95 / NT / ME / 2000 / XP / Vista / 7.0 / 8.0 Shell material: ABS Color:black,white Modulation method: GFSK Wired keyboard power: 1 x AAA battery (not included) Working current: 5mA (MAX) Sleep current: 0.5mA Effective distance: about 32.9FT (10M) reachability Temperature: 5℃-50℃ Humidity: 10%-85%RH 25 degrees Celsius ​Features: USB 2.0 wired/wireless technology, plug and play, no device driver, stable signal transmission, no delay digital keyboard, TPE-protection line, maximum working 1.25m. 18-key full-size concave 10-key design, suitable for laptops, banks, schools, companies, etc. The keycaps of the numeric keyboard have a life span of more than 10 million times. ABS material, small and slim design, the numeric keyboard is easy to carry around, the numeric keyboard is easy to press and silent, the back ergonomic tilt and anti-skid pad provide the best comfort. No battery required, automatically enters sleep/sleep mode, saves power and prolongs service life, don’t worry about running out of power on your laptop's numeric keypad. There are two color options, you can choose the one you like best according to your hobbies and needs. You can choose to give it as a gift to a businessman, such as an accountant. Package Included: 1 x Numeric Keypad notes: 1. Due to manual measurement, please allow a difference of 1-3 cm, and the difference between different colors, please allow 3-5 grams. 2. Due to screen differences, the color may be slightly different from what you expect, please allow. The Wireless Numeric Pad that can be used by plugging in the computer: no driver required; only 1 battery and one USB port is required; giving you the most stable USB link. Soft pressing touch: Provide you with the most comfortable angle of inclination and help reduce pressure on your wrist. The 19 key USB Numeric Keypad has minimal noise and is the best choice for processing spreadsheets, accounting documents, or financial applications. High key accuracy & stable rubber sheet at the bottom: The key name is clear, the key is raised, and the comfortable pressing feeling improves your work efficiency. The stable rubber sheet at the bottom never falls off, and it always fixes your USB number pad. The USB wireless number keypad is suitable for all kinds of laptops and desktop computers with Windows 2000, Mac, XP, Vista, or Windows 7 operating systems and above. The portable, light-weight design and the classic black numeric keypads are perfect for business trips or daily use, providing you with a more comfortable and convenient experience.