DP666 is a radio built on PE5PVB's open source TEF6686_ESP32 project. In addition to listening to radio stations, the project supports a wealth of advanced features, such as almost all RDS data display, automatic/manual station scanning, squelch, battery voltage display, changeable themes, multilingual support, station presets, and more. Key benefits and features sensitivity and selectivity: based on NXP automotivegrade TEF6686, with selectivity and ultra sensitivity. The tuner uses advanced algorithms (CEQ, EMS, PACS, noise canceller) and SDR signal processing to improve multipath, adjacent frequency interference, and weaksignal handling. Rich RDS and metadata support: displays almost all RDS information where available (RDS display requires local radio support). Flexible station management: supports automatic and manual station scanning and has station presets for quick access. User interface and : a 2.8inch color LCD screen with resistive touch, changeable themes, and multilingual UI for a tailored experience. Easy input and control: numeric keypad for fast frequency input. Longlasting power and portability: largecapacity 5000 mAh battery designed for extended standby and usage times. Robust hardware design: redesigned circuit board referencing the TEF6686 frontend receiving circuit to optimize performance while maintaining portability. Technical highlights Core technology: TEF6686 automotivegrade frontend tuner (NXP) with SDR signal processing. Display: 2.8inch color LCD with resistive touch. Input: numeric keypad for quick frequency entry. Power: 5000 mAh battery for extended operation. Interface and software: open source TEF6686_ESP32 project basis (PE5PVB reference). Usability features: almost full RDS data display, automatic/manual scanning, squelch control, battery voltage display, changeable themes, multilingual support, station presets. RDS requirement: RDS information display requires local radio support. What it enables in practice Everyday listening with reliable reception: sensitivity and advanced noise cancellation help deliver clearer audio even in challenging environments. Easy station management on the go: quick scanning and presets make switching between stations fast and convenient. user experience: themes and multiple languages let you tailor the interface to your preferences. Long sessions away from power: the 5000 mAh battery supports longer standby and usage times, reducing frequent recharging. Practical deployment scenarios: designed for portable use, incar or on outdoor setups, as well as indoor listening stations or hobby projects that leverage the TEF6686 frontend and SDR processing. Use scenarios Road trips and field work: enjoy reliable station reception with strong multipath and interference handling, use presets for quick access, and monitor power with battery voltage display. Home or workshop listening: take advantage of the color LCD interface, themes, and multilingual options for comfortable daily use, plus automatic/manual scanning to discover local stations. Educational or hobby projects: leverage the open source TEF6686_ESP32 foundation to explore SDRbased radio processing, frontend design refinements, and RDS data integration in a portable form factor. DP666 combines performance with practical features and a portable design, making it suitable for users who need reliable radio reception, flexible control, and clear RDS information in a compact device.