... ItemRF transmitter with four keys (remote controller)Coding ModeFixed code FrequencyFixed (customized 315MHz,330MHz,443.92MHz etc .Battery Model ... remote .2,RF transmitterDevelop all kinds of PCB with different function .For home /car alarm ,such asASK modulate mode remote ... ,gate opener,car cental system and so on .Available fixed code chip models : PT2240, PT2260,PT2262 ,EV1527,FP527, AX5326PT2242 , ...