The Nissan Dayz J (B21W) is a compact kei car designed for urban efficiency and practicality. Powered by a 659cc 3B20 inline-3 engine, it delivers approximately 49 horsepower at 6,500 rpm and 56 Nm of torque at 5,500 rpm, paired with a Continuously Variable Transmission (CVT) for smooth acceleration and optimal fuel economy. The front-wheel-drive configuration ensures nimble handling, making it ideal for city driving.

Measuring 3,395 mm in length, 1,475 mm in width, and 1,620 mm in height, the Dayz J offers a spacious interior relative to its compact exterior dimensions. The cabin comfortably seats four passengers, with thoughtful design elements maximizing space and comfort. The vehicle's lightweight construction, at approximately 830 kg, contributes to its fuel efficiency and maneuverability.

Standard features include power windows, air conditioning, and a user-friendly infotainment system. Safety is addressed with dual front airbags, Anti-lock Braking System (ABS), and Electronic Brake-force Distribution (EBD). The Nissan Dayz J's combination of compact size, efficient performance, and practical features make it a suitable choice for urban commuters seeking reliability and economy.