Profile: Xiamen Vs-Top Electronics Co., Ltd. is specialist in manufacturing professional home safety products. We are an ISO 9001:200 certified company. Our product line includes smoke & heat alarms, gas and wire alarm products. Our DC operated photoelectric type smoke alarm features a operated with single 9V DC block battery, photoelectric sensor for slow smoldering fires and low-battery and battery missing warning indicators. Our DC operated combustible gas alarm features a semiconductor gas sensor, resistance against cooking smoke or ethanol steam and a operation indicator.