The Texas Instruments TI-30X IIS Black Scientific Calculator is a handheld device with regular key size and display. It is powered by solar source and features an LCD display with backlight, making it easy to use in various lighting conditions. This calculator is designed for scientific calculations and includes calculus functions, making it a reliable tool for students, professionals, and anyone in need of precise mathematical calculations. The sleek black color adds a stylish touch to this durable and functional calculator from Texas Instruments.