Radio transmitting equipment type approval certificate or type approval certificate or SRRC, issued by the state administration of radio management committee, in accordance with China's laws and regulations of any radio transmitting products sold in the market, the use of frequencies must be approved by the radio management committee, approval refers to the radio transmitting equipment put into use before the research, production, import, purchase, technical indicators, in accordance with the parameters of the frequency spectrum technology management system.The main content of approval is to check and approve the spectrum parameters of radio transmitting equipment such as frequency, frequency band, transmitting power, frequency tolerance, bandwidth occupied, out-of-band transmission and stray transmission.