This is a vintage Hewlett-Packard HP 15C scientific calculator from 1984. It is a handheld model powered by batteries and comes with a case and new batteries. The calculator is a regular key size and is a vintage item.
Item Tag: Scientific
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Vintage HP-15C Scientific Calculator with Case
Good working HP-15C Scientific Calculator. Serial No# 2707A55439. There are many surface scratches to top silver faceplate and scratches on the display. Small HP 15C emblem on top right corner is missing. The backside has black marker smear on top edge and left side as shown by pen tip. Includes batteries, HP case and CD with HP-15C Calculator Owner’s Manual. Guaranteed working condition. Free shipping in USA.  
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Vintage Hewlett-Packard HP-15C Programmable Scientific Pocket Calculator 1982-89
The calculator is able to handle complex numbers and matrix operations. Although out of production, its popularity has led to high prices on the used market. The 15C used bulk CMOS technology for its processor, resulting in very low power consumption.