Pen color: Random color. LED color: Warm white. Penlight length: 13.5cm. Battery operated by AAA * 2 (NOT included). Diagnostic pocket clip activated nurse led healthcare penlight. Click and it holds, extra bright sealed concentric beam. Long-life and reusable, easy to use and affordable. Perfect for nurses, medical students, and home use. The pre-focused pinpoint lens directly illuminates eyes, ears and throat.