1. No need to download APPWIFI/Bluetooth to connect to the display. No need for network operation, simple operation, turn on WIFI to connect to the display, you can take for mobile phone as an example, to show the mobile phone connected to the screen projection device 2.5G/2.4G enhanced dual-band without delay and no jamming. for X40H upgrade uses 2.4G+5G dual-band transmission technology, with a delay as low as 0.04s, and the display screen displays the picture more stably in real time without jamming 3. WIFI connection within 520 meters for real-time screen projection. Even when you are far away from the phone screen, you can still see the picture clearly, providing you with more angles and possibilities (due to the interference transmission distance in different environments) 4. The newly upgraded technology has clear and visible picture quality. 40H uses the new decoding chip & 2-inch ultra-clear display to clearly restore every detail, liberate the rear camera function of the phone, and realize free photo taking without loss of picture quality 5. Small size and large capacity. It can be used for a week after charging once. Built-in 850mAh polymer lithium battery, 13 hours of ultra-long battery life allows you to keep your inspiration (the use time is related to the sound volume and screen status) The rear camera selfie retains a clearer beauty. Mini projection display, freeing the rear camera, helps to take higher quality photos or videos, replacing traditional selfie cameras Bluetooth camera: Easily capture selfies and video blogs with the built-in Bluetooth camera Wireless/wired screen sharing: Seamlessly connect your phone to the screen via wireless or wired connection for multiple viewing options Automatic language switching: Easily switch between different languages with the automatic language switching function for a user-friendly experience Adjustable screen size: customize the screen size according to your preferences to provide a comfortable viewing experience for different needs Usage steps: 1. Open the WIFI/Bluetooth function in the "Settings" of the mobile phone and search for -X40GH and click to enter the password: 1234567 2: Find the mirror screen in -down control center and search for -X40GH to start the screen projection after connecting Product name: -X40H mobile selfie display Screen size: 2-inch HD Rated power: 1.85W Wifi network: 2.4G/5G dual-band/Bluetooth 5.0 Capacity: for i0S 9.0+, for Android 2.0+ Interface: USB-C Input: 5V/1A Battery capacity: 850mAh Battery life: long battery life can be used for up to 13 hours Color: White Material: plastic Package Contents: 1 x for X40H Selfie Screen Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.