For sheer portability, the Kubota SpeedKeys offers a significant advantage. The unit itself is much smaller, at nearly a quarter of the size of the large RPG Keys, and it’s wireless, running on just two AAA batteries. 

The Kubota keypad can slide easily into a pocket.

Two AAAs power the wireless SpeedKeys.

The size of the RPG Keys unit alone approximates many laptops now, and can’t be taken on the go as easily as the SpeedKeys, which can literally slide into your pocket.