Orpat is one of the leading brands in the Indian electronic market. They provide different products like calculators, watches, clocks etc. I have a Orpat OT-512GT calculator with me. It gives many features like 120 steps check, real solar cells, auto correct etc. It gives 5 yrs battery life but I had changed it twice due to battery complaint. Its keypad gets jammed in the socket. Sometimes the cancel key will not work. When the key gets jammed we won’t be able to type anything. Its been nearly 6 months and its display is not functioning perfectly. I had bad experience with this product. I suggest other brand like Casio, for good quality calculators.