Model :Key5 Combo Product Code :POR 1407(black), POR 1569(Grey), POR 1658(Z-Black) Technology :2.4GHz Wireless Requirements :USB Dongle Body :Plastic Body Button:4 Buttons with Scroll Wheel Dimensions :51.4 (L)x 16.9 (W)x 4.3(H) Cm Weight :745 g