Check the listing for details. DETRON (HTH) Vintage Calculator Model 830MD - Working Condition. Condition: Used. Listed at 19.00 USD. DETRON (HTH) Vintage Calculator Model 830MD - Working Condition Shows signs of use but still very usable. Working perfectly Battery compartment is clean. ********************************************* Note: I have a fresh batch of vintage calculators to list. Close to 200 pieces. Please see my other listings for additional very cool, some very rare, models. And yes I will definitely combine shipping for multiple purchases. International buyers please ask me for combined shipping PRIOR to purchase. I cannot adjust the invoice after you buy the item. These are vintage calculators and in most instances they will show some signs of use and wear. Where there are noticeable imperfections or other defects I will make a note in the listing.