The app used is named "HFun", which can be found in all smartphone app stores. Please watch connection video to ensure proper syncing from your phone to the drone via the drone's built in WiFi network. Instructions are on our site! Make sure to watch the Instruction video on TRIMMING, which is located our site under the DRONE INSTRUCTIONS PAGE. This will get you familiar with what to expect, and teach you how to fly with precision! Drone-Clone Xperts Drone X Pro AIR 4K UHD Dual Camera Quadcopter with Follow Me Mode Gesture Control/Photo/Video FPV WiFi Real-Time Transmission and 2pcs Batteries Included (BLACK) Total Flight Time: 24-30mins -Each battery will provide approximately 12-15 mins of flight time (2 total drone batteries included with drone). Please watch "Trimming" video on this page, or our site on by going to the "Drone Instructions" page, to see how easy it is to "Fine-Tune" and control your drone. It's completely normal for ALL drones under $200 to drift in certain directions directly after take-off, all you have to do is simply TRIM (FINE-TUNE) the drone as seen in attached video. Notice your X Pro AIR drone will quickly get to a nice stable hover for optimal flight control.