Alps Alpine SKSU Compact Middle-Stroke TACT Switches feature a surface mount design and 100mΩ initial contact resistance rating. These switches are IP67 equivalent, water-proof, and dust-proof, with 250,000 operating life cycles (50mA, 16VDC). The SKSU tactile switches offer a 16VDC maximum rated voltage and 50mA maximum rated current. These middle-stroke TACT switches come in dimensions of 5.3mm x 5.4mm x 3.85mm and 5.3mm x 5.4mm x 4.34mm. Alps Alpine SKSU switches operate from -40°C to 90C° temperature range.