I bought this router from flipkart at only 999rs. Other companies do not make products with dual antenna within this price range. It does not support dual band. It works only at 2.4ghz band. The dual antenna is for increasing the signal strength.
As compared to single antenna router, this increased the signal range but the strength within the range is just double as compared to the single antenna router. If you will go for d-link or other companies, you will have to pay about 1500 rs, but you can get this router for only 1000rs. No signal breakdown or overheating issues. Simply a good router for 1000 rs.