Do not use in explosive environment gas station, natural gas, etc. Please follow the national laws and regulations and the local radio management department to use. Usually it cost about 35USD-50USD. If you receive defective item, please kindly notify us within 14 days. This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers".The seller is "pincei_us" and is located in this country: CN. This item can be shipped worldwide.