The LeSat F4 is a fully domestic 4G & Tiantong dual-mode handheld terminal. Integrated with multi-network communication and digital-analog intercom, it adopts a 225° foldable antenna, single Beidou positioning and quantum encryption. With dual-card dual-standby Android system and IP68 high-level protection, it ensures safe and stable communication for emergency, fire, outdoor and special industry offline scenarios.