Any 2G network system, including GSM900, DCS1800, CDMA850, PCS1900, and others, can be amplified with Raygnal's phone singal boosters. Signal-poor areas, such as the country, the hills, or the villages, can be used.
This filter is applied to the drying of various types of gas, and can make vapor mist particles which in the gas separated, achieving the purpose of drying.