... , Sound wave resonator (SAW) is used for stabilizing frequency, It is applied for wireless alarms, wireless controlling devices,etc.Using High ... according to your requirement)Working temperature -50°C~+80°CUse range Home alarm, car alarms, industrial control, motorcycle alarm system ... lower to delete the influence to the frequency by the metal part, for example, adjust 315Mhz to 312Mhz, 433Mhz ...