The lowest price of Smoke detector in Bangladesh is Tk-500/= only. Buy from Gazipur / Dhaka City at low price in Bdstall. There is currently 3 sellers.
Smoke and heat combined detector with fire alarm multi-detector, 24 DC voltage power, 65°C alarm temperature, 2050mA working current range. You will instantly know if any fire accident happened and get some time to rescue yourself.