The Slim Wireless Combo comes in two keyboard models, the CEX3 and the CEX1, which differ in size and key count. The CEX3 is a full-size keyboard with 104 keys, including a numeric keypad, which makes the CEX3 a good fit for a desk setup. The CEX1 is a compact keyboard with 78 keys and no numeric keypad, which makes the CEX1 better for travel and portability. The CEX3 and the CEX1 share the same wireless features and the same pairing steps.