I have checked Wi-Fi connection, initialization, camera, charging, browsing, and video playback before listing. Built-in antenna, One-Seg, and Full-Seg compatible. Because it has a built-in antenna, you can watch One-Seg and Full-Seg anywhere. No separate antenna is required like other One-Seg compatible models. You can also watch YouTube from the app. Even without a SIM contract, you can use compatible apps, games, the internet, etc., by connecting to Wi-Fi. Initialized. The device's charging performance is 80% or more. Usage restrictions: ○ Android 8.1, 3 GB, 32 GB, 23-megapixel camera, 4K video recording, Osaifu-Keitai, iris authentication, water-resistant/waterproof, Full-Seg, One-Seg, Hi-Res, GPS, 4G/LTE, tethering, nano-SIM compatible. OS: Android 8.1 CPU: Snapdragon 625 MSM8953 CPU Cores: Octa-core Internal ROM: 32 GB Internal RAM: 3 GB Charging Cable: Type B External Memory Type: microSDXC memory card Maximum External Memory Capacity: 256 GB Battery Capacity: 2850 mAh Screen Performance Size: 5.5 inches Resolution: 1920x1080 Panel Type: IPS-NEO Camera Image Stabilization: ○ 4K Video Recording: ○ Flash for Photography: ○ Body Size/Weight Width: 75 mm Height: 156 mm Thickness: 7.7 mm Weight: 169 g Functions Osaifu-Keitai/FeliCa: Osaifu-Keitai Authentication Function: Iris authentication Water Resistance/Waterproof: IPX5/IPX8 Full-Seg Compatible: ○ One-Seg Compatible: ○ Hi-Res Compatible: ○ GPS Compatible: ○ Network Maximum Download Data Speed: PREMIUM 4G: 262.5Mbps 4G/LTE: ○ Wireless LAN Standard: 802.11 a/b/g/n/ac Tethering: ○ Bluetooth: ○ NFC: ○ SIM: nanoSIM