... in Relays, Switches, Protectors, Thermostats and other Electro-mechanical Devices. We also can develop and manufacture all ... Noble Metal Product Co., Ltd., a subsidiary of Hongfa Electroacoustic Co., Ltd., was established in 1995 as an Electrical Contact Manufacturer. ... electric tool switches, buttons, timers, and other household electrical appliances.The price is changeable according to the adjustment ...