A pen camera is a small, discreet recording device designed to resemble a regular pen. It typically features a built-in camera and microphone, allowing users to capture video and audio without drawing attention. These devices are often used for personal security, surveillance, or capturing moments hands-free. The pen camera usually includes a rechargeable battery and can store footage on a memory card. Some models offer high-definition recording and can connect to computers for easy file transfer. Due to their covert nature, they are popular among private investigators and individuals seeking to document events without being noticed.