Klein Tools ET16 Borescope features a 9 mm camera surrounded by 6 LEDs attached to a 10-Foot (3 m) armored gooseneck cable. The digital camera has a USB Type-C (and micro-USB) connection for most Android (OTG 4.0 or higher) smartphones and devices. The camera and video output is displayed on the Android device using the free Klein Tools ET16 Borescope App, available for download on Google Play store. The ET16 does not require batteries; it is powered by device connection.WARNING Always wear approved eye protection. Do NOT use on energized circuits. Do NOT probe moving machinery. Do NOT probe moving machinery. See manual for complete set of warnings.