The Oasis Scientific Vividia W1149 WiFi Dual-Camera Borescope features two small cameras mounted on a 42" long 4.9mm diameter insertion tube. One is forward facing and the other is side-mounted for a 90-degree view. Its free app, "Videoscope i" is available from both the Apple app store and Google Play store. The Wi-Fi signal can cover a 20m distance, and the built-in rechargeable Li-ion battery can last for two hours after a full charge. The insertion probe is semi-rigid for easy operation and able to bend to desired angles. The borescope is suitable for car repair and maintenance, home and building inspection, A/C examination, and industrial quality control.