Mini Portable Transparent Digital LCD Display Electronic Clock w/ Sucker for Aoto Car Bathroom This product is made of transparent liquid crystal material, even if is sucked in the windshield will not affect the sight. Battery: AG10 button cell (Not included) The back of the clock has a sucker, can be firmly adsorbed on the surface of the liquid crystal and the operating clock surface. It is home and car ideal schedule Size: 9cm x 2.8cm x 1.5cm