The M55155/12XJ15 is a programmable timing counter type of IC (integrated circuit) produced by the Japanese company, Concord. This device is mainly used for generating time delay and counting operations with long life and high accuracy. It is highly reliable and can be used for a wide range of applications, including industrial automation. The IC has various features, such as 16-pin DIP (Dual-Inline Package) packaging and an adjustable frequency with a range of 0.05Hz to 5Hz. Additionally, it can output up to 4 timing and counting signals, has adjustable pulse width, and can be powered by either AC or DC. The device also features a built-in test mode, which allows users to check the device's performance, as well as a wide operating temperature range of -20C to +70C.