Radio Frequency, as know as RF, means RF current, it's high frequency AC change electromagnetic wave. AC change per second less than 1000 times is low frequency current, more than 10000 times is high frequency current. And RF is this kind of high frequency current. 
Based on CINRIO as your partner, you can use our RF approval service, which can help you to access global market. RF testing uses wireless technology performance and function, it covers many kinds of devices including:
Short range wireless communication device (SRD), BlueTooth, WLAN(802.11 abgn) and base station.
Repeater, CDMA2000, GSM, WCDMA, LTE cell phone.
PMR, DSC/ATIS/AIS, search and rescue beacon (including EPIRBs, ELTs, PLBs)
DECT/CAT-iq cell phone module, cell phone and base station. 
CINRIO can help you to meet RF, EMC, Safety and SAR international wireless standards. We can also submit technical documents to authority. We can make sure your product can meet local standards, including EU R&TTE/RED, US FCC and Canada IC, Japan VCCI/MIC, China CCC/SRRC/MII.