BS2316P-12-C - 

Electronic DC Buzzers, 400 Hz ± 50 Hz Frequency Operating

These INTERVOX® devices are designed to eliminate arcing and Rf noise commonly found in electro-magnetic type buzzers. They provide a low frequency sound that is easily recognized making them ideal for applications such as industrial controls, auto warning devices, test apparatus, appliance timers and intrusion alarms.
It is 4 pin termination