Function and Duration Time: this product can automatically clean the toilet bowl and keep it freshened. It can be used for about 2-3 months. 3 Scents: this product has lasting scent which can remove the odor. There are 3 types of scent for you to choose: ocean (blue), lemon (green) and peach (pink). Regardless of the scent of the product, the color of the rinse liquid is blue. User-friendly Design: this product brings you a convenient, clean, and hands-free experience, it also has no damage to the water tank. Easy to Use: put this product directly in the toilet water tank gently, and put the portable rope outside the water tank. (No need to open the bottle cap, do not put the bottle upside down or lying down). When to Replace: when the color of the rinse liquid disappears, pull out the empty bottle with the rope and replace it with a new one. Note: it's recommended to rinse the toilet bowl before using this product. And this product should be kept away from the water inlet in the water tank, and avoid direct flushing of water to ensure that the product can be used for a longer time.