1) If you need the samples for testing, please tell us your requirements, such as what equipment is the sample used for , power, voltage, frequency, air volume, noise, etc. We will make a solution according to your requirements as soon as possible. Our engineers will make samples, and testing in our laboratory,samples will be tested in various ways, such as plugging test, high temperature test, waterproof test, damage test and so on. After passing the test, our engineers will collect data and then make specifications, which we will send to customers. After matching the data, our engineers will make the same samples, and salesmen will send the samples to customers. Install on customer equipment for testing. 2) Lead time for making sample: about 7 days to 15 days. 3) The transportation freight of samples: We usually provide samples for your testing free of charge, and the express fee will be borne by you. You only need to tell us the express account number, and we will send samples to you according to the account number (such as DHL, TNT, FedEx,EMS and other international express).