Features - Heavy duty Calculator with Check & Correct Function and Preset 5% Tax Rate. DS-2JT features the classic design of earlier popular heavy duty calculators, with a dark gray plastic case surrounding the display and keypad that exudes reliability. Direct calculation of Price Plus Tax & Price Less Tax with a preset tax of 5% (can be changed to any rate). Durable Anti-fade keys: 28 keys produced by injecting plastic of two different colors, do not wear or fade with use. The 300 Steps Check function helps to prevent calculation mistakes: Review up to 300 calculation steps; Auto Review by pressing one single button; can make changes in values and operators and re-execute to obtain a new result. Grand total: automatic totalization of the results of different calculations. Insert/Delete: add or delete steps from Calculation Memory (up to 300 steps). Recheck with Sound Assist: a buzzer sounds to alert the user of an error on a second calculation. Key Layout and Key Cap Shape: ergonomically shaped keys. Three-Key Rollover: registers the next key press even before the previous key is released. Non-slip Structure: large rubber feet keep it from slipping. Function Command Signs: symbol (+,-,x,/) indicates current operation status. Silent Touch Keys: designed for silent operation. Solar & Battery: solar/battery powered. Basic Information - Product features: Recheck with sound assist, 300 steps check, Tax calculation, Metal Faceplate. Product type: Metal Faceplate, Desktop Type. Number of digits: 12 digits. Liquid crystal display: Extra Large display, Function command signs, 3-digit comma markers. Key characteristics: Durable Anti-fade Keys, Plastic keys. Key functions: Key rollover, Shift key, Sign Change, Mark-up, Mark-down. Memory: Grand total, Independent memory. Power supply: Solar & Battery. Size (D x W x H): 207 x 146.5 x 51.3 mm. Weight: 305 g. Display Settings: Decimal selector (4/3/2/1/0/ADD2); Rounding selector (F, CUT, UP, 5/4). Calculation Functions - Basic calculation: Basic Calculation, Regular percent, Profit margin percent, Square root. Applied calculation: Recheck with sound assist, 300 steps check, Tax calculation.