The HAI-12 II is designed for use in Class I, Division II hazardous locations where explosive gases are present, such as rocket launch pads. This unit is certified to meet Class I, Div II by an independent third-party laboratory. It features a sealed enclosure with a front panel designed for personnel wearing protective gear with heavy gloves. Sunlight-readable LCD panels display four pages of 12 line keys (48 line keys). Design features include membrane-protected front panel buttons, two volume control knobs, and a 20W speaker. An optional unit extends headset/handset jacks and basic control functionality to a remote position. The HAI-12 II connects to the MVP using a T1 line with a KTMX.