We will give big discount for the future business. We will BLOCK the buyers who directly open cases without contacting us first! If you receive a defective item, you need to return or discount. Or sent you a replacement if you need.We will answer your question in 48 hours, deal with one time every day. Saturday and Sunday is our holiday, If you send me message on Saturday and Sunday, we can't reply you in time. But please no worries and we will reply you on next Monday immediately. This item is in the category "Business, Office & Industrial\Industrial Automation & Motion Controls\Other Automation Equipment". The seller is "wudongpo2011" and is located in this country: CN. This item can be shipped worldwide.