Wireless numeric keypad, convenient with USB port compatibility. - Brand: ELECOM - Model Name: TK-TDM017 - Connectivity: Wireless 2.4GHz - Function: Numeric keypad - Power Source: 1 AA battery - Compatible Devices: PCs and tablets with USB ports Although unused, the item has been opened once. (I mistakenly purchased it and had to buy a replacement.) Thank you for looking.