The Texas Instruments TI-5048 is a desktop adding machine calculator that offers paper-free functionality, making it a convenient and efficient tool for business and office tasks. With its compact size and reliable brand reputation of Texas Instruments, this calculator is perfect for streamlining calculations in a professional setting. The included AC cord ensures continuous power supply, allowing for uninterrupted work without the need for batteries. Tested working with non oem power adapter. Battery compartment has no corrosion. Works on battery and on AC power brick.