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Product Model:RS-640 Encoder Sensor Quatity:1pcs 100% Original New Best Service For Roland RS-640 Factory produceOur Guarantee1. Fast delivery and two years warranty.2. 3 times QC tested before leaving factory to guarantee the quality.3. 100% guarantee and 1:1 replacement for defective goods.4. Responsible and thoughtful after-sale service.5. High quality which backed by a 100% satisfaction.6. 30 Day Money Back Guarantee. Return&Refund1. If there are any problems with our product,you can request returning or refunding within 7days after received the items.But please contact with our customers service first before returning or refunding,we will try our best to make you satisfied. 2. All items must be returned in their original condition,or we will refuse to make a refund. 3. Before leaving the factory. All items have been rigorously tested. We will ensure excellent product quality. 4. Within 30 days of receipt of goods. If you are not satisfi