The HT27S11 is a desktop trackball designed for ergonomic and ambidextrous use with non-contacting optical encoders and USB 2.0 protocol connectivity. It features a 2.25-inch diameter thermoset phenolic ball with polished stainless steel shaft and encased stainless steel bearings, rated for 5,000,000 180-degree rotations with 6 ounces of vertical force. The device operates over a temperature range of -25°C to +70°C, accepts USB input of 4.75V to 5.25V at 25 mA maximum, and weighs 460 grams with overall dimensions of 5.0" W × 5.5" D × 2.7" H. This trackball is ideal for users requiring precise cursor control in professional workstations, CAD applications, and accessibility-focused computing environments where ergonomic design and reliable optical tracking are essential.