It is a 4.5mm high/ compact/ crystal unit for surface mounting. From old datasheet system For ECU. AC-DC Converter, 30 Watt, Input VAC: 90~260, Output VDC: 12, Max Output Current(A): 2.5, Package: Encapsulated, Isolation(VDC): 3000, Operating Temp QUARTZ CRYSTAL RESONATOR, 10 MHz