keypad is and comfortable to use,Wireless transmission is very convenient to USB receiver plug and play,laptop numeric keypad can be used with this key pad at same time,easy to carry. 18 function keys have complete control function,Use 2.4G frequency band, have opened a key to open the keyboard,and there are LED lights flashing . The keycaps life of more than 10 .Operating Current: 5mA (MAX) Sleep Current: 0.5mA Effective Distance: Approximately 32.8FT Accessibility. Need to master the keyboard keypad switch,If the battery is less than 1.1V,the LED indicator light alerts.No Power Button Needed,Use 1*AAA Battery(Note: Battery Not Include). Featuring a full keypad with number lock, the Wireless Numeric Keypad is a great wireless solution for extending your existing keyboard. Material: Plastic Color: Black Product Dimensions: 16.76 x 9.4 x 2.8cm/6.6 x 3.7 x 1.1 inches package content: 1 * 2.4G Wireless Numeric Keypad Black 1 * Wireless USB Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.