The MicroPen from Carson Optical is a 24x-53x power microscope pen with an extremely lightweight and portable design. This microscope pen features a built-in LED light that provides a bright, powerful and clear image. Use the built-in zoom and focus knobs to view intricate details of almost anything. The MicroPen fits easily in your pocket so you can bring it with you anywhere. The MicroPen runs on 3-SG3 button cell batteries (included). The MicroPen is backed by Carson. At Carson, we strive to make sure our customers are 100% satisfied with the quality of our products. Carson will repair or replace your pocket microscope if it is found to have manufacturing defects in materials or workmanship..