Product:The whole body of the trolley is made of new ABS material, which is firm and durable, not easy to break or deform, and can be used for a long time. Usage: Press the left side button of the pull rod to roll up the curtain, and the right side button to roll down the curtain. SAFETY:The new roller shutter pull rod controller replaces the previous homebox pull bead, safer for kids and pets. Installation: just remove the original roller shutter right side bead and put the pull rod on it. We will have installation instructions as well as video. Don't worry about the installation AFTER-SALES: If you don't receive this rod or have any quality problems, please feel free to contact us for your replacement.