5.5mm DIAMETER TINY CAMERA? The diameter of this USB endoscope camera head is only 5.5mm (0.2 inch), perfect to get into very small holes for inspection. STABLE CONNECTION? USB endoscope has more stable and convenient than wifi connection. Suitable for OTG Android 4.4+ Devices, MAC& Win PC. 6 ADJUSTABLE LEDS? 6 adjustable LED lights on camera tip that greatly helps to acquiring the smooth video and HD image in dark or low-light condition, even underwater. 16.4FT WATERPROOF SEMI-RIDGED CABLE? Armed with a Flexible cable that can control the inspection cameras direction easily, bend and keep it's shape to access confined spaces. Combined with the IP67 waterproof feature, it can be widely used for inspecting pipeline, sewer, wall crevice, hole, cable chute troubled you before.