Godrej Aer Pocket flushes out all the bad odour from our surroundings. It never leaves any traces of bad odour. It lasts for around 30 to 40 days. The usage is as simple as that. just open the pack and hang it as long as it smells good. The source comes in the form of thick gelly unlike odonil kind of brands which are a sort of hard solids. We get it in different odours. In my view its apt for bathrooms. It smells so beautifully that u start feeling fresh. The empty pack is still hanging in my room bt is working quite good. Its a budget saver too.