Thermal Printing calculator is super fast and super quiet, at 8 lines per second. This thermal printing calculator provides Check Cal (corrects, deletes mistakes and inserts a new number anytime), 12-digit display, four-key memory, percent, markup/markdown, 00 keys, input correction key, item count and average, date and time display and set, preset text printing, decimal system, constant calculation, total and grand total, repeat printing function. AC power.