OTUOER 100% Blackout Portable Roller Shades with Magnetic Buckle, No Tools No Drill Cordless Blackout Blinds for Windows, Thermal Insulated Black out Curtains for Bedroom, Travel(21" W x 64" H, Black)

These cordless roller shades attach with a magnetic buckle, so you can cover a standard 21‑by‑64‑inch window without drilling or tools. They're useful for creating a dark sleeping environment in a bedroom or dorm, and they also help keep a room cooler by reducing heat gain. If you travel frequently or need a temporary solution for a rental, you can pack and reinstall them in minutes.