PRODUCT DESCRIPTION:-COMPACT, COMFORTABLE TO USE AND EASY TO CARRY-HELP YOU TO HANDLE WITH NUMBERS MORE PROFESSIONAL AND EFFICIENTLY WHEREVER AND WHENEVER-KEYBOARD COMES WITH 18 KEYS OF 0-9 NUMBER KEYS, DEL, ENTER, NUM LOCK, BACKSPACE, + – * /-SIMPLE PLUG AND PLAY, NO DRIVER INSTALLATION REQUIREMENTS-WIRELESS TRANSMISSION, FAST AND SENSITIVE, UP TO 10-METER WORKING RANGE-BEST FOR NOTEBOOK USERS WHO ALWAYS WORK WITH NUMBER KEYS / MINI DIGITAL KEYBOARD-“NUM LOCK” KEY, SWITCH TO THE NUMBER(0-9) FUNCTION AND OTHER FUNCTIONS. SPECIFICATION:.ITEM NAME: WIRELESS NUMERIC KEYPAD.NUMBER OF KEYS: 18KEYS.INTERFACE: WIRELESS 2.4G.VOLTAGE: DC 1.5V.COLOR: BLACK.CASE MATERIAL: ABS.DIMENSION: 14*8.5X2 CM.KEYCAPS LIFE: MORE THAN 10 MILLION TIMES.OPERATION RANGE: 10M (WITHOUT SIGNAL DISTURBANCE AND NO DIRECTION LIMIT).POWER: 1*AAA BATTERY (NOT INCLUDED).SYSTEM SUPPORT: WINDOWS XP/7/8/VISTA, LINUX, MAC OS 9 ETC. PACKAGE INCLUDE:1 * WIRELESS NUMERIC KEYPAD1 * USB RECEIVER