1、Large Focal Length: Using a 3.9mm camera, the image resolution is up to 1920x1080P, and the focal length is 4‑6cm, and the imaging is clearer. 2、Engine Inspection: Can be used for carbon deposition detection in auto engines, observing the condition of the engine helps to extend the life of the engine. 3、Other Functions: Supports long pipe or sewer inspections. Semi rigid cables are not easy to break and deform, and it is easy to check hard to reach places. 4、IP67 Waterproof: Boresocope with 6 LEDs for clear visibility in dark environments. Waterproof design probes can detect wet or underwater places. 5、Wireless Connection: WiFi connection, high compatibility, mobile phones for Android and for iOS systems, convenient connection, easier observation. Item Type: Car Engine Endoscope Material: ABS Resolution: 1080P Lens Diameter: Approx. 3.9mm/0.15in Waterproof Rating: IP67 Focal Length: 4-6cm/1.57-2.36inBattery: Lithium polymer battery 18650(1800mAh) 1 x Car Engine Endoscope 1 x Charging Cable 1 x Manual