The fully configurable, single-handed ERGO F21 is made up of twenty-one (21) single step, highly reliable membrane switch buttons, up to three (3) option single step side buttons and a three-position maintained toggle switch. With two control buttons adjacent to an easy to read LCD display, the ERGO F21 operator can access valuable machine data with confidence and ease. The transmitter features a status LED on the front panel and is powered with one (1) Hetronic 3.6V NiMH rechargeable battery. The ERGO F21 is available either as a pre-configured standard or can be customized to your needs.