programmable but could be upgraded, and the Professional (November), which included on-board macro programming, a foot switch, and Keyware software for Windows. The Essential had a suggested retail price of while the Professional was more expensive at . In July 1997, the mid-range Classic sub-line was launched to replace the Model 130, offering key remapping and macro programmability, but with half the memory of the Professional. Specific model numbers included the Essential (KB132PC), Classic (KB133PC), and Professional (KB134PC); Classic and Professional models also were available with QWERTY/Dvorak dual-legend keys (KB133PC/QD and KB134PC/QD, respectively). The Ergo Elan (KB333PC) was launched in 1999 with a revised (U.S. International) layout to accommodate European and Japanese users; it has basic programmability, corresponding to the capabilities of the Classic. In 2002, Kinesis released the Advantage line, updating its contoured keyboards with a USB interface. The non-programmable model was dropped and the USB contoured keyboards were available in two versions: the Advantage was offered in black or white and the Advantage Pro had a metallic silver finish with black keys. Specific models included the Advantage MPC (KB500USB) and Advantage Pro MPC (KB510USB); MPC indicates Macintosh and PC compability. The Advantage MPC model also was available with QWERTY/Dvorak dual-legend keys (KB500USB/QD) and in a version (KB500USB-LF) that uses Cherry MX red linear keyswitches. The Advantage2 line was released in 2016; one major change was implementing mechanical Cherry ML keyswitches for the function key row. Internally, the Advantage2 had a new "SmartSet" engine and expanded memory for macro programming. Like the preceding Advantage, the Advantage2 has options for dual-printed keycaps and low-force Cherry MX red keyswitches. Maxim The Maxim adjustable keyboard was launched in 1997 to compete with similar adjustable staggered-column keyboards with split halves and/or tenting such as the Apple Adjustable, Microsoft Natural, and IBM Adjustable (M15)/Lexmark Select-Ease keyboards. The front/back slope (6° and 12°), rotation (0–30°), and lateral tenting (0°, 8°, 14°) were adjustable to accommodate a wider variety of users; Kinesis advised new users to gradually increase split opening and tenting angles to acclimate to a more relaxed hand/wrist position. The Maxim is a tenkeyless QWERTY layout with the split halves bordered by F6, 6, T, G, and B on the left and F7, 7, Y, H, and N on the right; a numeric keypad with PS/2 interface was available separately. In addition, the Maxim is compatible with the Kinesis 3-action footswitch via a daisychain