An electrochemical cell comprises as an anode, a lithium transition metal oxide or sulphide compound which as a B2X4n\u2212 spinel-type framework structure of an AB2S4 spinel wherein A and B are metal cations selected from Li, Ti, V, Mn, Fe and Co, X is oxygen or sulphur, and n\u2212 refers to the overall charge of the structural unit B2X4 of the framework structure. A user who has a cell phone automatically can obtain access to the vehicle. The optical glass is characterized by including B2O3+SiO2 in an amount of 10 to 70%, Bi2O3 in an amount of 5% or more and less than 25%, RO+Rn2O in an amount of 5 to 60%, with each component in the range expressed in oxide-based mole, and is characterized in that transparency in the visible region is high, and that the transition point is 520\xb0 C.