Before Installation Notes 1. Tips 1: Test before installation When testing, do not remove any protective film or tags. Please pay attention to the problem of ectricity. Before attempting any repair, be sure to ground yoursf is an ESD (ectro discharge) strap. This will prevent ectricity from damaging the ectronic components within the phone. Ensure you wear eye protection and use caution not to cut your finger with the gl ers. 2. Tips 2: Simulates testing Screen replacement is very fragile product. We strongly suggest test before installation. Please simulates testing, which means mobile phone apart, (motherboard + LCD or screen) connected audio cable and new replacement, power on, test finished. If test OK, please install it. If it can not show, please us at the very first time. And please do not force it to be installed in mobile phone. We will not be responsible if the mobile phone is damaged during installation. 3. Tips 3: Do not over-bend cable Please make sure LCD cable Do not over-bend. Over 90 degrees bent will cause black display.About the product 1. Replacement touch screen for Asus Zenfone 2 / ZE551ML. 2. Replace your broken or unusable item with a new one. 3. Make your device look more refreshing than ever. 4. Complety fit and work. 5. Each item has been checked and in good condition before shipping. 6. Professional installation is highly recommended. We will not be responsible for any damages to your clphone/mobile phone that you may cause during the changing of replacement parts.