The Rose RV1-KTZ (previously known as RV1-KM / RV1-KMA) model is an innovative space saving design that fits in 1U space. It contains an 83 key keyboard with a separate numeric keypad and an integrated high-resolution Trackball.
The keyboard has gold cross point key switches with a lifetime of 20,000,000 key presses and 18mm key spacing.
The Rose RV1-KTZ is the direct replacement to the RV1-KM / RV1-KMA. According to the vendor, there is no real tangible difference between old and new units.