【GREAT TEST TOOL】Fiber optic bypass loop can perfectly diagnose fiber-optic line problems, remove or add a single in-vehicle device, without affecting the in-vehicle fiber-optic network. It is an excellent tool for diagnosing/bypassing MOST optical system components. | 【HIGH EFFICIENCY】Male and female fiber optic loop adapter can help you find the fault point quickly and diagnose the problem quickly. It is not only helpful for motherboard problems, but also for indicator problems, whether it is a motherboard transceiver problem or a cable connection problem. | 【WIDELY ADAPTED】Auto diagnostic cable tool can be used to close the optic ring and bypass the useless equipment. Compatible for Brand car Audi, BMW, Mercedes, Porsche, Volkswagen etc. According to the practical application , different models can be connected simultaneously. | 【WHAT YOU GET】This mercedes optical bypass loop adapter set includes 1 pcs male fiber optic loop adapter + 1 pcs female fiber optic loop adapter. Suitable for Benz Audi Mercedes BMW VW Porsche. Please make sure your car using this type standard connector. | 【SATISFACTORY SERVICE】How long is the warranty/renew? We offer a hassle-free 12-month warranty and 24-hour friendly customer service. If there is any dissatisfaction with the product, or the parts are missing, please contact us at any time, whether it is a new one or a refund, we will definitely give you a satisfactory answer. Be responsible for your choice, let you place an order with peace of mind.